fade line on top and right of div - html

Question

Does anybody know how to do this? I need something like this:
I can find somebody doing it with .
hr {
border: 0;
height: 1px;
background: #333;
background: -webkit-gradient(linear, left top, right top, color-stop(0%,hsla(0,0%,0%,0)), color-stop(50%,hsla(0,0%,0%,.75)), color-stop(100%,hsla(0,0%,0%,0)));
background: -webkit-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: -moz-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: -ms-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: -o-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
}
Link: http://jsfiddle.net/HdwKA/662/
But is there anyway I can do if with ::before or ::after?
If I want to add one more fade line on the left? What should I do?

Answer 1

Yes you can, by giving the element an absolute position, you can position the :before & :after pseudo element anywhere in respect to its element.
body {
background-color: black;
}
.hr {
background-color: green;
position: relative;
width: 100px;
height: 100px;
left: 150px;
top: 150px;
}
.hr:before {
content: '';
display: block;
position: absolute;
height: 50px;
width: 1px;
top: -50px;
left: 50%;
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ffffff+0,ffffff+100&0+0,1+100 */
background: -moz-linear-gradient(top, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00ffffff', endColorstr='#ffffff',GradientType=0 ); /* IE6-9 */
}
.hr:after {
content: '';
display: block;
position: absolute;
right: -50px;
top: 50%;
height: 1px;
width: 50px;
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ffffff+0,ffffff+100&1+0,0+100 */
background: -moz-linear-gradient(left, rgba(255,255,255,1) 0%, rgba(255,255,255,0) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(left, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to right, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#00ffffff',GradientType=1 ); /* IE6-9 */
}
<div class="hr">
</div>
UPDATED
Here's an example using span
body {
background-color: black;
}
.hr {
background-color: green;
position: relative;
width: 100px;
height: 100px;
left: 150px;
top: 150px;
}
.top {
display: block;
position: absolute;
height: 50px;
width: 1px;
top: -50px;
left: 50%;
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ffffff+0,ffffff+100&0+0,1+100 */
background: -moz-linear-gradient(top, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00ffffff', endColorstr='#ffffff',GradientType=0 ); /* IE6-9 */
}
.bottom {
display: block;
position: absolute;
height: 50px;
width: 1px;
bottom: -50px;
left: 50%;
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ffffff+0,ffffff+100&1+0,0+100;White+to+Transparent */
background: -moz-linear-gradient(top, rgba(255,255,255,1) 0%, rgba(255,255,255,0) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#00ffffff',GradientType=0 ); /* IE6-9 */
}
.right {
display: block;
position: absolute;
right: -50px;
top: 50%;
height: 1px;
width: 50px;
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ffffff+0,ffffff+100&1+0,0+100 */
background: -moz-linear-gradient(left, rgba(255,255,255,1) 0%, rgba(255,255,255,0) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(left, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to right, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#00ffffff',GradientType=1 ); /* IE6-9 */
}
.left {
display: block;
position: absolute;
left: -50px;
top: 50%;
height: 1px;
width: 50px;
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ffffff+0,ffffff+100&0+0,1+100 */
background: -moz-linear-gradient(left, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(left, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to right, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00ffffff', endColorstr='#ffffff',GradientType=1 ); /* IE6-9 */
}
<div class="hr">
<span class="left"></span>
<span class="right"></span>
<span class="top"></span>
<span class="bottom"></span>
</div>

Answer 2

that works with a pseudo selector.
I added you a solution to a fiddle based on a DIV element (but could be any other valid CSS selector):
http://codepen.io/marcbaur/pen/ZOxaxE/
div::after {
display: block;
width: 100%;
content: '';
border: 0;
height: 1px;
background: #333;
background: -webkit-gradient(linear, left top, right top, color-stop(0%,hsla(0,0%,0%,0)), color-stop(50%,hsla(0,0%,0%,.75)), color-stop(100%,hsla(0,0%,0%,0)));
background: -webkit-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: -moz-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: -ms-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: -o-linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
background: linear-gradient(left, hsla(0,0%,0%,0) 0%, hsla(0,0%,0%,.75) 50%, hsla(0,0%,0%,0) 100%);
you just have to make sure that you define content, display and width properties.