EDIT: Chromium-specific issue it seems...
I'm using a div element that contains other div elements, like a column with cells in a table. Columns are next to each other with proper absolute positioning. When I use box-shadow inset to emulate borders, things look great, until the outermost container gets a transform scale on it, then the box-shadow border leaks into vertical borders when I only want horizontal borders. Any ideas?
CodePen:
https://codepen.io/mattalie/pen/RwazNmj
<div class='container'>
<div class='group'>
<div class='col' style='left:5px;width:125px'>
<div class='cell'>2000</div>
<div class='cell'>2000</div>
<div class='cell'>2000</div>
</div>
<div class='col' style='left:130px;width:125px'>
<div class='cell'>asdfasdf</div>
<div class='cell'>asdfasdf</div>
<div class='cell'>asdfasdf</div>
</div>
<div class='col' style='left:255px;width:125px'>
<div class='cell'>999999</div>
<div class='cell'>999999</div>
<div class='cell'>999999</div>
</div>
</div>
</div>
.container {
transform: scale(0.672);
}
.group {
font-size: 28px;
position: absolute;
left: 0;
top: 0;
width: 500px;
height: 200px;
background-color: red;
}
.col {
position: absolute;
overflow: hidden;
background-color: yellow;
}
.cell {
position: relative;
padding: 5px 8px 5px 8px;
color: #000000;
background-color: #ffffff;
box-shadow: inset 0px -3px 0px #000000;
box-sizing: border-box;
}
Thanks in advance, this one is killing me.
Pic - vertical lines should not be there
It doesn't seem to have to do with box-shadow. Chrome seems to have problems with rounding when using transform and which creates gaps between elements so that the background shines through.
Here are two other posts that have similar problems:
Transform Scale Causing Gaps/Lines
Scaling results in gaps between CSS shapes
However there doesn't seem to be a universal solution. Based on those posts and some experiments my first suggestion would be to take a step back and to look for a different solution to your design.
What you are currently doing seems to be a bit hacky to me (absolute positioning, using box-shadow to emulate borders) anyway, so you may want to re-consider these choices and also check if you need to use transform or if you need to have different background colors and and a box-shadow here which shine through the gaps.
Alternatively one even more hacky solution would ironically use normal (outer) box-shadows to fill in the gaps, in your case a white shadow on the columns and cells:
.col {
/* ... */
box-shadow: 0 0 0 1px white;
}
.cell {
/* ... */
box-shadow: inset 0px -3px 0px #000000, 0 0 0 1px white;
}
Is it possible to add a border to a box-shadow?
I want to create a class with a coloured offset with that offset being outlined in a black border.
Now I know I can create a div and offset it to get this desired look, but I want to know if it's possible to do it without so I can just create a class and add it to the divs that I want to do this too.
I attached a snippet showing the colour offset but I would like the red offset to be outlined in a black border.
.example-div{
width: 100px;
height: 100px;
border: 1px solid black;
box-shadow: -5px 5px red;
}
<div class="example-div">
</div>
You can add additional box-shadows to your div to get that effect. For your case update your box-shadow property to something like this
box-shadow: -5px 5px red,
-5px 5px 0px 3px black;
This resource has tons of more info about box-shadows and it's syntax https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow if you want to follow.
You can add a CSS pseudo-element to your class which automatically will add another object behind the main object on each element which has that class. Use absolute position, a negative z-index, 100% width and height and determine the offset with the left or right and bottom or top parameters as in this example:
(note: You need a non-transparent background for the main element when you use this method)
.example-div {
width: 100px;
height: 100px;
border: 1px solid black;
position: relative;
background: #fff;
}
.example-div::after {
content: '';
position: absolute;
z-index: -1;
left: -5px;
bottom: -5px;
width: 100%;
height: 100%;
background: red;
border: 1px solid black;
}
<div class="example-div">
</div>
CSS outline and border aren't going to be much help unfortunately, as the box-shadow doesn't really exist and those will still target the element's bounding box (which is unaffected by the box-shadow).
You could make use of ::before or ::after, but that gets a little complicated for what you're trying to do.
One thing you could do is make use of multiple box-shadows. box-shadow takes a comma separated list of shadows, and it's supported in all majors browsers. The trick here would be to make use of the 4th (underutilized IMHO) parameter for box-shadow, called spread-radius. This will "spread" (expand) or "choke" (shrink) the box shadow's reference frame by that many pixels before the blur radius is applied.
In your case, for a 2px wide "border" around the box-shadow, you could do the following:
.example-div {
width: 100px;
height: 100px;
border: 1px solid black;
box-shadow: -5px 5px red, -5px 5px 0 2px blue;
}
<div class="example-div"></div>
I have a div which I have positioned using the absolute positioning property of css. And now I want to know whether there is a way to allow this div showing in the exact same position that I am seeing right now in my screen even when the screen is smaller or larger without changing the absolute positioning property of the div?
this is just a rough example:
<div class="name"> I am somewhere in the body </div>
...................
..................so and so codes...
..................
<div class="display">I want to stand beside the class called name </div>
If I write the css for the display, Then it comes exactly beside the class name
.display {
position: absolute;
width: 200px;
top : 132px; [assume]
left : 200px; [assume]
border: #D3D3D3;
-webkit-box-shadow: 5px 5px 15px #888;
-moz-box-shadow: 5px 5px 15px #888;
box-shadow: 5px 5px 15px #888;
}
It is displaying correct for my screen. But if the screen size varies then it is no longer showing the correct position since I have used the absolute positioning property. But now I want to find whether there is a way or a trick to solve it without changing the absolute positioning property.
Wrap this like -
<div id="someId">
<div class="display"></div>
</div>
and add this css
#someId {
position: relative;
width: 0;
height: 0;
}
This seems like something for the float property, change your css like:
.display {
float:right;
width: 200px;
border: #D3D3D3;
-webkit-box-shadow: 5px 5px 15px #888;
-moz-box-shadow: 5px 5px 15px #888;
box-shadow: 5px 5px 15px #888;
}
I have a <div> element and I want to put a border on it. I know I can write style="border: 1px solid black", but this adds 2px to either side of the div, which is not what I want.
I would rather have this border be -1px from the edge of the div. The div itself is 100px x 100px, and if I add a border, then I have to do some mathematics to make the border appear.
Is there any way that I can make the border appear, and ensure the box will still be 100px (including the border)?
Set box-sizing property to border-box:
div {
box-sizing: border-box;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
width: 100px;
height: 100px;
border: 20px solid #f00;
background: #00f;
margin: 10px;
}
div + div {
border: 10px solid red;
}
<div>Hello!</div>
<div>Hello!</div>
It works on IE8 & above.
You can also use box-shadow like this:
div{
-webkit-box-shadow:inset 0px 0px 0px 10px #f00;
-moz-box-shadow:inset 0px 0px 0px 10px #f00;
box-shadow:inset 0px 0px 0px 10px #f00;
}
Example here: http://jsfiddle.net/nVyXS/ (hover to view border)
This works in modern browsers only. For example: No IE 8 support.
See caniuse.com (box-shadow feature) for more info.
Probably it is belated answer, but I want to share with my findings. I found 2 new approaches to this problem that I have not found here in the answers:
Inner border through box-shadow css property
Yes, box-shadow is used to add box-shadows to the elements. But you can specify inset shadow, that would look like a inner border rather like a shadow. You just need to set horizontal and vertical shadows to 0px, and the "spread" property of the box-shadow to the width of the border you want to have. So for the 'inner' border of 10px you would write the following:
div{
width:100px;
height:100px;
background-color:yellow;
box-shadow:0px 0px 0px 10px black inset;
margin-bottom:20px;
}
Here is jsFiddle example that illustrates the difference between box-shadow border and 'normal' border. This way your border and the box width are of total 100px including the border.
More about box-shadow:here
Border through outline css property
Here is another approach, but this way the border would be outside of the box. Here is an example.
As follows from the example, you can use css outline property, to set the border that does not affect the width and height of the element. This way, the border width is not added to the width of an element.
div{
width:100px;
height:100px;
background-color:yellow;
outline:10px solid black;
}
More about outline: here
Yahoo! This is really possible. I found it.
For Bottom Border:
div {box-shadow: 0px -3px 0px red inset; }
For Top Border:
div {box-shadow: 0px 3px 0px red inset; }
You can use the properties outline and outline-offset with a negative value instead of using a regular border, works for me:
div{
height: 100px;
width: 100px;
background-color: grey;
margin-bottom: 10px;
}
div#border{
border: 2px solid red;
}
div#outline{
outline: 2px solid red;
outline-offset: -2px;
}
Using a regular border.
<div id="border"></div>
Using outline and outline-offset.
<div id="outline"></div>
Although this question has already been adequately answered with solutions using the box-shadow and outline properties, I would like to slightly expand on this
for all those who have landed here (like myself) searching for a solution for an inner border with an offset
So let's say you have a black 100px x 100px div and you need to inset it with a white border - which has an inner offset of 5px (say) - this can still be done with the above properties.
box-shadow
The trick here is to know that multiple box-shadows are allowed, where the first shadow is on top and subsequent shadows have lower z-ordering.
With that knowledge, the box-shadow declaration will be:
box-shadow: inset 0 0 0 5px black, inset 0 0 0 10px white;
div {
width: 100px;
height: 100px;
background: black;
box-shadow: inset 0 0 0 5px black, inset 0 0 0 10px white;
}
<div></div>
Basically, what that declaration is saying is: render the last (10px white) shadow first, then render the previous 5px black shadow above it.
outline with outline-offset
For the same effect as above the outline declarations would be:
outline: 5px solid white;
outline-offset: -10px;
div {
width: 100px;
height: 100px;
background: black;
outline: 5px solid white;
outline-offset: -10px;
}
<div></div>
NB: outline-offset isn't supported by IE if that's important to you.
Codepen demo
Use pseudo element:
.button {
background: #333;
color: #fff;
float: left;
padding: 20px;
margin: 20px;
position: relative;
}
.button::after {
content: '';
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
border: 5px solid #f00;
}
<div class='button'>Hello</div>
Using ::after you are styling the virtual last child of the selected element. content property creates an anonymous replaced element.
We are containing the pseudo element using absolute position relative to the parent. Then you have freedom to have whatever custom background and/or border in the background of your main element.
This approach does not affect placement of the contents of the main element, which is different from using box-sizing: border-box;.
Consider this example:
.parent {
width: 200px;
}
.button {
background: #333;
color: #fff;
padding: 20px;
border: 5px solid #f00;
border-left-width: 20px;
box-sizing: border-box;
}
<div class='parent'>
<div class='button'>Hello</div>
</div>
Here .button width is constrained using the parent element. Setting the border-left-width adjusts the content-box size and thus the position of the text.
.parent {
width: 200px;
}
.button {
background: #333;
color: #fff;
padding: 20px;
position: relative;
}
.button::after {
content: '';
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
border: 5px solid #f00;
border-left-width: 20px;
}
<div class='parent'>
<div class='button'>Hello</div>
</div>
Using the pseudo-element approach does not affect the content-box size.
Depending on the application, approach using a pseudo-element might or might not be a desirable behaviour.
I know this is somewhat older, but since the keywords "border inside" landed me directly here, I would like to share some findings that may be worth mentioning here.
When I was adding a border on the hover state, i got the effects that OP is talking about. The border ads pixels to the dimension of the box which made it jumpy.
There is two more ways one can deal with this that also work for IE7.
1)
Have a border already attached to the element and simply change the color. This way the mathematics are already included.
div {
width:100px;
height:100px;
background-color: #aaa;
border: 2px solid #aaa; /* notice the solid */
}
div:hover {
border: 2px dashed #666;
}
2 )
Compensate your border with a negative margin. This will still add the extra pixels, but the positioning of the element will not be jumpy on
div {
width:100px;
height:100px;
background-color: #aaa;
}
div:hover {
margin: -2px;
border: 2px dashed #333;
}
11 Years Later but heres the answer:
Just use outline:
outline: 0.2vw solid red;
I hope i can help someone who sees this question also 11 Yeas Later.
for consistent rendering between new and older browsers, add a double container, the outer with the width, the inner with the border.
<div style="width:100px;">
<div style="border:2px solid #000;">
contents here
</div>
</div>
this is obviously only if your precise width is more important than having extra markup!
If you use box-sizing: border-box means not only border,
padding,margin, etc. All element will come inside of the parent
element.
div p {
box-sizing: border-box;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
width: 150px;
height:100%;
border: 20px solid #f00;
background-color: #00f;
color:#fff;
padding: 10px;
}
<div>
<p>It was popularised in the 1960s with the release of Letraset sheets</p>
</div>
Best cross browser solution (mostly for IE support) like #Steve said is to make a div 98px in width and height than add a border 1px around it, or you could make a background image for div 100x100 px and draw a border on it.
You can look at outline with offset but this needs some padding to exists on your div. Or you can absolutely position a border div inside, something like
<div id='parentDiv' style='position:relative'>
<div id='parentDivsContent'></div>
<div id='fakeBordersDiv'
style='position: absolute;width: 100%;
height: 100%;
z-index: 2;
border: 2px solid;
border-radius: 2px;'/>
</div>
You might need to fiddle with margins on the fake borders div to fit it as you like.
A more modern solution might be to use css variables and calc. calc is widely supported but variables is not yet in IE11 (polyfills available).
:root {
box-width: 100px;
border-width: 1px;
}
#box {
width: calc(var(--box-width) - var(--border-width));
}
Although this does use some calculations, which the original questions was looking to avoid. I think this is an ok time to use calculations as they are controlled by the css itself. It also has no need for additional markup or misappropriating other css properties that may be needed later on.
This solution is only really useful if a fixed height isn't needed.
One solution I didn't see mentioned above is the case where you have padding on your input, which I do 99% of the time. You can do something along the lines of...
input {
padding: 8px;
}
input.invalid {
border: 2px solid red;
padding: 6px; // 8px - border or "calc(8px - 2px)"
}
What I like about this is that I have the full menu of border + padding + transition properties for each side.