Heading with line afterwards, with 2 different sizes - html

Question

I am trying to achieve the following, with pure CSS and no images:
As you can see, its a heading with a line afterwards. The problem is, that the line should has 2 different colors and more important, 2 different heights.
The first parts color is orange, has a height of 3px and a fixed width of 100px (padding-left: 15px)
The sedond parts color is #E1E1E1 and should fill the rest of the line.
My first try was this:
<h1><span>OUR ARTICLES</span></h1>
<style>
h1 {
overflow: hidden;
}
h1 span {
display: inline-block;
position: relative;
}
h1 span:after {
content: "";
position: absolute;
height: 1px;
top: 45%;
width: 999px;
background: #E1E1E1;
border-left: 100px solid orange;
left: 100%;
margin-left: 15px;
}
</style>
See http://jsfiddle.net/oyxmxoLs/
But as you can see, I can't make the orange part thicker than the grey one.
Any ideas?

Answer 1

Another way: Flexbox
With display: flex you don't have to give the line a certain width and you can make sure it is always responsive.
We are going here with an progressive enhancement approach. We'll make a cut after IE8 by using ::before instead of :before. In IE9 only the grey line will be shown (underneath the title).
h1 {
align-items: center;
color: #444;
display: flex;
font: 18px/1.3 sans-serif;
margin: 18px 15px;
white-space: nowrap;
}
h1::before {
background-color: orange;
content: "";
height: 4px;
margin-left: 10px;
order: 2;
width: 100px;
}
h1::after {
background-color: #E1E1E1;
content: "";
display: block;
height: 2px;
order: 3;
width: 100%;
}
<h1>Our articles</h1>
Do not forget to add vendor-prefixes!

Answer 2

You can solve this by using :before and :after
http://jsfiddle.net/oyxmxoLs/1/
h1 {
overflow: hidden;
}
h1 span {
display: inline-block;
position: relative;
}
h1 span:before {
content: "";
position: absolute;
height: 1px;
top: 45%;
width: 999px;
background: #E1E1E1;
left: 100%;
margin-left: 15px;
}
h1 span:after {
content: "";
position: absolute;
height: 3px;
top: 45%;
width: 100px;
background: orange;
left: 100%;
margin-left: 15px;
margin-top:-1px;
}
<h1><span>OUR ARTICLES</span></h1>

Answer 3

You can also use the :before pseudo-element to add the orange line.
h1 {
overflow: hidden;
}
h1 span {
display: inline-block;
position: relative;
}
h1 span:after, h1 span:before {
content: "";
position: absolute;
height: 1px;
left: 100%;
top: 45%;
margin-left: 15px;
}
h1 span:after {
width: 999px;
background: #E1E1E1;
}
h1 span:before {
height: 3px;
z-index: 1;
margin-top: -1px;
border-radius: 2px;
width: 100px;
background: orange;
}
<h1><span>OUR ARTICLES</span></h1>