I am trying to style the background of a react app page. So, naturally, I style the main div that has all the components in it with the background property in CSS. This main div has a className named Wrapper in my app. However, when I do that, only part of the screen changes the background whereas I expect it to take the full screen. Here's the code and here's how it looks:
JSX:
render() {
return (
<div className="wrapper" >
<div>Inner content</div>
</div>
) }
CSS:
.wrapper {
overflow: hidden;
background: linear-gradient(#42275a, #734b6d);
}
As you can see only the top part changes color, but the rest of the page is still white.
I have tried adding to the wrapper: "height: 100%;", "min-height: 100%" and/or "height: 100vh;", "min-height: 100vh" but nothing has worked.
I also tried to change the body property in CSS like so
body {
background: linear-gradient(#42275a, #734b6d);
}
but what I get is an ugly line that seems to separate the wrapper from the body like this:
My question is, why is the main div (wrapper) taking up only a small part of the screen when actually it is the main div which contains all that content that seems to go off into the white screen. Why doesn't it take up the entire screen?
Also, why is body separate from wrapper or vice versa?
And lastly, how do I change the background without any kind of separation like that line? Because what is even more weird is that the body seems to be fragmented as well. See this image where you can see the body of the document seems to be fragmented (notice the line that separates colors):
Some more code as requested. I am not sure if this is useful but I guess this is all that is relevant.
This is the App.js file's code:
render() {
if (this.state.loading) {
return null;
}
else {
return (
<div className='app'>
{this.state.user ?
<LoggedIn /> :
(<HomePage />)}
</div >
);
}
}
.app {
height: 100%
}
This is the Index.js's and Index.css's code:
ReactDOM.render(
<Elements stripe={promise}>
<BrowserRouter>
<React.StrictMode>
<ScrollToTop>
<App />
</ScrollToTop>
</React.StrictMode>
</BrowserRouter>
</Elements>,
document.getElementById('root')
);
html,body
{
width: 100%;
height: 100%;
margin: 0px;
padding: 0px;
align-items: center;
}
Here's a screenshot of the Elements section from the Developer tools:
I guess I have included everything that is higher up in the DOM, I suppose. Please let me know if anything specific can be of any use. Thanks.
I have removed all the CSS properties from wrapper as suggested by Dan Zuzevich in the comments. It did remove the wrapper and the screen is, indeed, filled with the gradient as set in body's CSS. However, the screen is still divided by lines or fragmented if you will. Any idea why? I want one whole body with the gradient color. Here are some screenshots:
Since no one seems to have been able to help me get rid of the lines, I kept doing my own research and found my answer here - CSS3 gradient background set on body doesn't stretch but instead repeats?.
Basically, here's what helped get rid of the lines:
body {
background-image: linear-gradient(to bottom, #42275a, #734b6d);
margin: 0;
background-repeat: no-repeat;
background-attachment: fixed;
}
Hopefully, this will be helpful to someone in the future.
Happy coding.
Don.
I've experimented with a simple "feature" on my Shopify theme, where I want a link to jump to a specific part of the page - quite simple, and I've done it like this.
Jump to section
<span id="jumpto">The section i want to jump to</span>
It works like a charm, but! I have a sticky header, where the "The section i want to jump to" is hidden behind. Is there any way, with css, push it a bit down down, so "The section I want to jump to" is shown, right beneath the header.
Basically I want the span element to appear for example 50px beneath the header.
My setup looks something like this
<div id="sectiona">
</div>
<span id="jumpto">The section i want to jump to</span>
<div id="sectionb">
</div>
If i use margin og padding, the gab between would be to big.
You can use JavaScript to solve your problem and make smooth scrolling as well.
$('a[href*="#"]').click(function(){
$('html, body').animate({
scrollTop: $( $(this).attr('href') ).offset().top - 50
}, 500);
return false;
});
This might not the prettiest solution, but it should do the trick. By having an empty span (.jump-marker) acting as the jumping point you can offset the position where the anchor jumps to.
.jump-marker {
position: absolute;
margin: -120px 0 0;
}
You could also use JS/jQuery to offset the scroll distance by your header height and also allow smooth scrolling, which is much more pleasing to the eye, but that wasn't asked for! :)
Example:
body {
padding-top: 120px;
}
header {
position: fixed;
top: 0;
left: 0;
right: 0;
background: rgba(255,0,0,0.25);
height: 100px;
}
.more-content {
height: 1000px;
background: #f7f7f7;
}
section {
position: relative;
}
.jump-marker {
position: absolute;
margin: -120px 0 0;
}
<header></header>
Jump to section
<div class="more-content"></div>
<section>
<div class="section-content">
<span id="jumpto" class="jump-marker"></span>
The section i want to jump to
</div>
</section>
<div class="more-content"></div>
I make a basic header fixed and made the links tag link offset from the place I want to link too. This solution is really rough but can work with good CSS and placing
html:
<div class="jumpTo">
<a id="0">0</a>
</div>
<h2>0</h2>
css:
.jumpTo{
margin-bottom: 100px;
font-size: 0;
}
https://jsfiddle.net/ovcx2t9z/
or a fiddle based on the Jquery solution
You can use JavaScript to solve your problem and make smooth scrolling as well.
$('a[href*="#"]').click(function(){
$('html, body').animate({
scrollTop: $( $(this).attr('href') ).offset().top - 50
}, 500);
return false;
});
https://jsfiddle.net/qy03xb1r/2/
How is the page layed out? Have you tried using padding or margin adjustments like.. padding-top:50px; or margin-top:50px.
I have an app built on Cordova and on some of my pages I am able to scroll horizontally out of my content into white space.
This is weird as I have nothing there that extends beyond my #wrapper, which is set to width: 100%.
So I was wondering if there was a way I could disable horizontal scrolling in the app altogether?
UPDATE:
Code on page as requested:
body {
background-color: #fff;
font-family:Arial, Helvetica, sans-serif;
color: #b7b8b9;
height: 100%;
width: 100%;
}
iframe{
border: none;
width: 100%;
/*margin-top: 50px;*/
}
#header{
height: 50px;
width: 100%;
}
<body>
<div id="wrapper">
<div id="header">
<div class="headerback">Home</div>
<div class="headerrefresh"><script>var pathname = window.location.pathname;</script><script>document.write('Refresh')</script></div>
<div class="headertitle"><h2>Get the Look</h2></div>
</div><!--HEADER-->
<iframe src="http://www.mbff.com.au/getthelook"></iframe>
</div>
</body>
Try to debug your page in Chrome (webkit) with the exact dimensions of your device. This solves most rendering issues for me.
I do not know the specific issue here, but it looks like one of your elements is flowing outside of the wrapper. You could for example try this in your css:
div.wrapper { overflow: hidden; width: inherit; }
Although it might be a better idea to find out why your page is expanding horizontally?
I was looking for the solution to this problem for a long time.
Finally I solved it in the following way.
I set style for bodyand html tags:
position: fixed;
width: 100%;
height: 100%;
overflow: hidden;
After that I've added div to body and set the style for it:
overflow-y: auto;
height: 100%;
So, I have got fixed body, which contains div with vertical scroll bar.
// Phone Gap disable only horizontal scrolling in Android.
// Add this code in your Phone Gap Main Activity.Initially Declare the variable
private float m_downX;
//Then add this code after loadUrl
this.appView.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
// save the x
m_downX = event.getX();
}
break;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP: {
// set x so that it doesn't move
event.setLocation(m_downX, event.getY());
}
break;
}
return false;
}
});
Try adding the following code to your .html file:
document.body.addEventListener('touchmove', function(event) {
event.preventDefault();
}, false);
For the sake of completeness, I thought the answer which makes use of the official method of doing such a thing via the preference tag should be added:
<preference name="DisallowOverscroll" value="true"/>
Supported by Android and iOS according the documentation.
Default: false
Set to true if you don't want the interface to display any feedback when users scroll past the beginning or end of content. On iOS, overscroll gestures cause content to bounce back to its original position. on Android, they produce a more subtle glowing effect along the top or bottom edge of the content.
In my case it was broken styling like below
<body>
<div style="margin-left:5%; width:100%">Content</div>
</body>
which cause div to became horizontally bigger than body. I could see scroll when app run in browser. Set width to 90% (as it was initially intended) fixed the problem.
Generally, as it already pointed out here, enough to find element with wrong style which makes your page expanding horizontally and fix it.
BTW DisallowOverscroll was not helpful in above case.
This question already has answers here:
Fixed page header overlaps in-page anchors
(38 answers)
Closed 7 years ago.
I am trying to clean up the way my anchors work. I have a header that is fixed to the top of the page, so when you link to an anchor elsewhere in the page, the page jumps so the anchor is at the top of the page, leaving the content behind the fixed header (I hope that makes sense). I need a way to offset the anchor by the 25px from the height of the header. I would prefer HTML or CSS, but Javascript would be acceptable as well.
You could just use CSS without any javascript.
Give your anchor a class:
<a class="anchor" id="top"></a>
You can then position the anchor an offset higher or lower than where it actually appears on the page, by making it a block element and relatively positioning it. -250px will position the anchor up 250px
a.anchor {
display: block;
position: relative;
top: -250px;
visibility: hidden;
}
I found this solution:
<a name="myanchor">
<h1 style="padding-top: 40px; margin-top: -40px;">My anchor</h1>
</a>
This doesn't create any gap in the content and anchor links works really nice.
I was looking for a solution to this as well. In my case, it was pretty easy.
I have a list menu with all the links:
<ul>
<li>one</li>
<li>two</li>
<li>three</li>
<li>four</li>
</ul>
And below that the headings where it should go to.
<h3>one</h3>
<p>text here</p>
<h3>two</h3>
<p>text here</p>
<h3>three</h3>
<p>text here</p>
<h3>four</h3>
<p>text here</p>
Now because I have a fixed menu at the top of my page I can't just make it go to my tag because that would be behind the menu.
Instead, I put a span tag inside my tag with the proper id.
<h3><span id="one"></span>one</h3>
Now use 2 lines of CSS to position them properly.
h3{ position:relative; }
h3 span{ position:absolute; top:-200px;}
Change the top value to match the height of your fixed header (or more).
Now I assume this would work with other elements as well.
FWIW this worked for me:
[id]::before {
content: '';
display: block;
height: 75px;
margin-top: -75px;
visibility: hidden;
}
As this is a concern of presentation, a pure CSS solution would be ideal. However, this question was posed in 2012, and although relative positioning / negative margin solutions have been suggested, these approaches seem rather hacky, create potential flow issues, and cannot respond dynamically to changes in the DOM / viewport.
With that in mind I believe that using JavaScript is still (February 2017) the best approach. Below is a vanilla-JS solution which will respond both to anchor clicks and resolve the page hash on load (See JSFiddle). Modify the .getFixedOffset() method if dynamic calculations are required. If you're using jQuery, here's a modified solution with better event delegation and smooth scrolling.
(function(document, history, location) {
var HISTORY_SUPPORT = !!(history && history.pushState);
var anchorScrolls = {
ANCHOR_REGEX: /^#[^ ]+$/,
OFFSET_HEIGHT_PX: 50,
/**
* Establish events, and fix initial scroll position if a hash is provided.
*/
init: function() {
this.scrollToCurrent();
window.addEventListener('hashchange', this.scrollToCurrent.bind(this));
document.body.addEventListener('click', this.delegateAnchors.bind(this));
},
/**
* Return the offset amount to deduct from the normal scroll position.
* Modify as appropriate to allow for dynamic calculations
*/
getFixedOffset: function() {
return this.OFFSET_HEIGHT_PX;
},
/**
* If the provided href is an anchor which resolves to an element on the
* page, scroll to it.
* #param {String} href
* #return {Boolean} - Was the href an anchor.
*/
scrollIfAnchor: function(href, pushToHistory) {
var match, rect, anchorOffset;
if(!this.ANCHOR_REGEX.test(href)) {
return false;
}
match = document.getElementById(href.slice(1));
if(match) {
rect = match.getBoundingClientRect();
anchorOffset = window.pageYOffset + rect.top - this.getFixedOffset();
window.scrollTo(window.pageXOffset, anchorOffset);
// Add the state to history as-per normal anchor links
if(HISTORY_SUPPORT && pushToHistory) {
history.pushState({}, document.title, location.pathname + href);
}
}
return !!match;
},
/**
* Attempt to scroll to the current location's hash.
*/
scrollToCurrent: function() {
this.scrollIfAnchor(window.location.hash);
},
/**
* If the click event's target was an anchor, fix the scroll position.
*/
delegateAnchors: function(e) {
var elem = e.target;
if(
elem.nodeName === 'A' &&
this.scrollIfAnchor(elem.getAttribute('href'), true)
) {
e.preventDefault();
}
}
};
window.addEventListener(
'DOMContentLoaded', anchorScrolls.init.bind(anchorScrolls)
);
})(window.document, window.history, window.location);
Pure css solution inspired by Alexander Savin:
a[name] {
padding-top: 40px;
margin-top: -40px;
display: inline-block; /* required for webkit browsers */
}
Optionally you may want to add the following if the target is still off the screen:
vertical-align: top;
My solution combines the target and before selectors for our CMS. Other techniques don't account for text in the anchor. Adjust the height and the negative margin to the offset you need...
:target::before {
content: '';
display: block;
height: 180px;
margin-top: -180px;
}
This takes many elements from previous answers and combines into a tiny (194 bytes minified) anonymous jQuery function. Adjust fixedElementHeight for the height of your menu or blocking element.
(function($, window) {
var adjustAnchor = function() {
var $anchor = $(':target'),
fixedElementHeight = 100;
if ($anchor.length > 0) {
$('html, body')
.stop()
.animate({
scrollTop: $anchor.offset().top - fixedElementHeight
}, 200);
}
};
$(window).on('hashchange load', function() {
adjustAnchor();
});
})(jQuery, window);
If you don't like the animation, replace
$('html, body')
.stop()
.animate({
scrollTop: $anchor.offset().top - fixedElementHeight
}, 200);
with:
window.scrollTo(0, $anchor.offset().top - fixedElementHeight);
Uglified version:
!function(o,n){var t=function(){var n=o(":target"),t=100;n.length>0&&o("html, body").stop().animate({scrollTop:n.offset().top-t},200)};o(n).on("hashchange load",function(){t()})}(jQuery,window);
For modern browsers, just add the CSS3 :target selector to the page. This will apply to all the anchors automatically.
:target {
display: block;
position: relative;
top: -100px;
visibility: hidden;
}
You can do it without js and without altering html. It´s css-only.
a[id]::before {
content: '';
display: block;
height: 50px;
margin: -30px 0 0;
}
That will append a pseudo-element before every a-tag with an id. Adjust values to match the height of your header.
I had been facing a similar issue, unfortunately after implementing all the solutions above, I came to the following conclusion.
My inner elements had a fragile CSS structure and implementing a position relative / absolute play, was completely breaking the page design.
CSS is not my strong suit.
I wrote this simple scrolling js, that accounts for the offset caused due to the header and relocated the div about 125 pixels below. Please use it as you see fit.
The HTML
<div id="#anchor"></div> <!-- #anchor here is the anchor tag which is on your URL -->
The JavaScript
$(function() {
$('a[href*=#]:not([href=#])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
&& location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top - 125 //offsets for fixed header
}, 1000);
return false;
}
}
});
//Executed on page load with URL containing an anchor tag.
if($(location.href.split("#")[1])) {
var target = $('#'+location.href.split("#")[1]);
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top - 125 //offset height of header here too.
}, 1000);
return false;
}
}
});
See a live implementation here.
For the same issue, I used an easy solution : put a padding-top of 40px on each anchor.
As #moeffju suggests, this can be achieved with CSS. The issue I ran into (which I'm surprised I haven't seen discussed) is the trick of overlapping previous elements with padding or a transparent border prevents hover and click actions at the bottom of those sections because the following one comes higher in the z-order.
The best fix I found was to place section content in a div that is at z-index: 1:
// Apply to elements that serve as anchors
.offset-anchor {
border-top: 75px solid transparent;
margin: -75px 0 0;
-webkit-background-clip: padding-box;
-moz-background-clip: padding;
background-clip: padding-box;
}
// Because offset-anchor causes sections to overlap the bottom of previous ones,
// we need to put content higher so links aren't blocked by the transparent border.
.container {
position: relative;
z-index: 1;
}
Solutions with changing position property are not always possible (it can destroy layout) therefore I suggest this:
HTML:
<a id="top">Anchor</a>
CSS:
#top {
margin-top: -250px;
padding-top: 250px;
}
Use this:
<a id="top"> </a>
to minimize overlapping, and set font-size to 1px. Empty anchor will not work in some browsers.
Borrowing some of the code from an answer given at this link (no author is specified), you can include a nice smooth-scroll effect to the anchor, while making it stop at -60px above the anchor, fitting nicely underneath the fixed bootstrap navigation bar (requires jQuery):
$(".dropdown-menu a[href^='#']").on('click', function(e) {
// prevent default anchor click behavior
e.preventDefault();
// animate
$('html, body').animate({
scrollTop: $(this.hash).offset().top - 60
}, 300, function(){
});
});
The above methods don't work very well if your anchor is a table element or within a table (row or cell).
I had to use javascript and bind to the window hashchange event to work around this (demo):
function moveUnderNav() {
var $el, h = window.location.hash;
if (h) {
$el = $(h);
if ($el.length && $el.closest('table').length) {
$('body').scrollTop( $el.closest('table, tr').position().top - 26 );
}
}
}
$(window)
.load(function () {
moveUnderNav();
})
.on('hashchange', function () {
moveUnderNav();
});
* Note: The hashchange event is not available in all browsers.
You can achieve this without an ID using the a[name]:not([href]) css selector. This simply looks for links with a name and no href e.g. <a name="anc1"></a>
An example rule might be:
a[name]:not([href]){
display: block;
position: relative;
top: -100px;
visibility: hidden;
}
Instead of having a fixed-position navbar which is underlapped by the rest of the content of the page (with the whole page body being scrollable), consider instead having a non-scrollable body with a static navbar and then having the page content in an absolutely-positioned scrollable div below.
That is, have HTML like this...
<div class="static-navbar">NAVBAR</div>
<div class="scrollable-content">
<p>Bla bla bla</p>
<p>Yadda yadda yadda</p>
<p>Mary had a little lamb</p>
<h2 id="stuff-i-want-to-link-to">Stuff</h2>
<p>More nonsense</p>
</div>
... and CSS like this:
.static-navbar {
height: 100px;
}
.scrollable-content {
position: absolute;
top: 100px;
bottom: 0;
overflow-y: scroll;
width: 100%;
}
There is one significant downside to this approach, however, which is that while an element from the page header is focused, the user will not be able to scroll the page using the keyboard (e.g. via the up and down arrows or the Page Up and Page Down keys).
Here's a JSFiddle demonstrating this in action.
This was inspired by the answer by Shouvik - same concept as his, only the size of the fixed header isn't hard coded. As long as your fixed header is in the first header node, this should "just work"
/*jslint browser: true, plusplus: true, regexp: true */
function anchorScroll(fragment) {
"use strict";
var amount, ttarget;
amount = $('header').height();
ttarget = $('#' + fragment);
$('html,body').animate({ scrollTop: ttarget.offset().top - amount }, 250);
return false;
}
function outsideToHash() {
"use strict";
var fragment;
if (window.location.hash) {
fragment = window.location.hash.substring(1);
anchorScroll(fragment);
}
}
function insideToHash(nnode) {
"use strict";
var fragment;
fragment = $(nnode).attr('href').substring(1);
anchorScroll(fragment);
}
$(document).ready(function () {
"use strict";
$("a[href^='#']").bind('click', function () {insideToHash(this); });
outsideToHash();
});
I'm facing this problem in a TYPO3 website, where all "Content Elements" are wrapped with something like:
<div id="c1234" class="contentElement">...</div>
and i changed the rendering so it renders like this:
<div id="c1234" class="anchor"></div>
<div class="contentElement">...</div>
And this CSS:
.anchor{
position: relative;
top: -50px;
}
The fixed topbar being 40px high, now the anchors work again and start 10px under the topbar.
Only drawback of this technique is you can no longer use :target.
Adding to Ziav's answer (with thanks to Alexander Savin), I need to be using the old-school <a name="...">...</a> as we're using <div id="...">...</div> for another purpose in our code. I had some display issues using display: inline-block -- the first line of every <p> element was turning out to be slightly right-indented (on both Webkit and Firefox browsers). I ended up trying other display values and display: table-caption works perfectly for me.
.anchor {
padding-top: 60px;
margin-top: -60px;
display: table-caption;
}
I added 40px-height .vspace element holding the anchor before each of my h1 elements.
<div class="vspace" id="gherkin"></div>
<div class="page-header">
<h1>Gherkin</h1>
</div>
In the CSS:
.vspace { height: 40px;}
It's working great and the space is not chocking.
how about hidden span tags with linkable IDs that provide the height of the navbar:
#head1 {
padding-top: 60px;
height: 0px;
visibility: hidden;
}
<span class="head1">somecontent</span>
<h5 id="headline1">This Headline is not obscured</h5>
heres the fiddle: http://jsfiddle.net/N6f2f/7
You can also add an anchor with follow attr:
(text-indent:-99999px;)
visibility: hidden;
position:absolute;
top:-80px;
and give the parent container a position relative.
Works perfect for me.
A further twist to the excellent answer from #Jan is to incorporate this into the #uberbar fixed header, which uses jQuery (or MooTools). (http://davidwalsh.name/persistent-header-opacity)
I've tweaked the code so the the top of the content is always below not under the fixed header and also added the anchors from #Jan again making sure that the anchors are always positioned below the fixed header.
The CSS:
#uberbar {
border-bottom:1px solid #0000cc;
position:fixed;
top:0;
left:0;
z-index:2000;
width:100%;
}
a.anchor {
display: block;
position: relative;
visibility: hidden;
}
The jQuery (including tweaks to both the #uberbar and the anchor approaches:
<script type="text/javascript">
$(document).ready(function() {
(function() {
//settings
var fadeSpeed = 200, fadeTo = 0.85, topDistance = 30;
var topbarME = function() { $('#uberbar').fadeTo(fadeSpeed,1); }, topbarML = function() { $('#uberbar').fadeTo(fadeSpeed,fadeTo); };
var inside = false;
//do
$(window).scroll(function() {
position = $(window).scrollTop();
if(position > topDistance && !inside) {
//add events
topbarML();
$('#uberbar').bind('mouseenter',topbarME);
$('#uberbar').bind('mouseleave',topbarML);
inside = true;
}
else if (position < topDistance){
topbarME();
$('#uberbar').unbind('mouseenter',topbarME);
$('#uberbar').unbind('mouseleave',topbarML);
inside = false;
}
});
$('#content').css({'margin-top': $('#uberbar').outerHeight(true)});
$('a.anchor').css({'top': - $('#uberbar').outerHeight(true)});
})();
});
</script>
And finally the HTML:
<div id="uberbar">
<!--CONTENT OF FIXED HEADER-->
</div>
....
<div id="content">
<!--MAIN CONTENT-->
....
<a class="anchor" id="anchor1"></a>
....
<a class="anchor" id="anchor2"></a>
....
</div>
Maybe this is useful to somebody who likes the #uberbar fading dixed header!
#AlexanderSavin's solution works great in WebKit browsers for me.
I additionally had to use :target pseudo-class which applies style to the selected anchor to adjust padding in FF, Opera & IE9:
a:target {
padding-top: 40px
}
Note that this style is not for Chrome / Safari so you'll probably have to use css-hacks, conditional comments etc.
Also I'd like to notice that Alexander's solution works due to the fact that targeted element is inline. If you don't want link you could simply change display property:
<div id="myanchor" style="display: inline">
<h1 style="padding-top: 40px; margin-top: -40px;">My anchor</h1>
</div>
Here's the solution that we use on our site. Adjust the headerHeight variable to whatever your header height is. Add the js-scroll class to the anchor that should scroll on click.
// SCROLL ON CLICK
// --------------------------------------------------------------------------
$('.js-scroll').click(function(){
var headerHeight = 60;
$('html, body').animate({
scrollTop: $( $.attr(this, 'href') ).offset().top - headerHeight
}, 500);
return false;
});
I ran into this same issue and ended up handling the click events manually, like:
$('#mynav a').click(() ->
$('html, body').animate({
scrollTop: $($(this).attr('href')).offset().top - 40
}, 200
return false
)
Scroll animation optional, of course.