Alright, here is the thing. This is what I'm trying to accomplish, which I did so far:
The problem is I use hardcoded pixels right now, but it really needs to be more responsive. So it needs a height of 100% (not 200px like now). And the total width of the diagonal and content containers needs to be 50%, like the image above (so not hardcoded 100px like now). The main problem seems to be the diagonal, cause it almost seems I can only use pixels and not percentages. So if the content block gets more content, it will expand, but the diagonal will not, which is a problem.
It looks like a position absolute could fix it, but then I can't really place the content and diagonal blocks next to each other anymore. Now I gave them two different colors to be clear, but in the live example they need to look like one shape with the same background color.
.shape {
width:400px;
margin:0 auto;
display: block;
height: 200px;
position: relative;
background-image: url('https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSQdX7yx0pVXUlaNF7WkbSJpZp5r0TflV3WdsojKKK1Xon_1hh08l4OL1yd');
}
.diagonal {
height:0;
border-width: 0px 0 200px 100px;
border-style:solid;
border-color: transparent transparent transparent #d71f55 ;
float: left;
}
.content {
height: 100%;
width: 100px;
background-color: #888;
float: left;
color: #fff;
}
<div class="shape">
<div class="content">
Content goes here
Like this
</div>
<div class="diagonal"></div>
</div>
EDIT:
By the way, I already tried using two backgrounds as well, like:
background-color: #f87f73;
background-image: -webkit-linear-gradient( -28deg, #f87f73 0%, #f87f73 60%, #292423 60%, #292423 60%);
background-image: linear-gradient( -28deg, #f87f73 0%, #f87f73 60%, #292423 60%, #292423 60%);
But that really got ugly. Too pixelated.
Edit 2:
Browser which needs to be supported:
OS: windows 8/10 : ** browsers: Chrome 47/48 ** Firefox 43/44 ** Internet Explorer 11
OS: mac OSX 10.9/10.10 ** Chrome 47/48 ** Firefox 43/44 ** Safari 8/9
OS: android 5/6 ** Chrome latest version
OS: iOS 8/9 ** Safari latest version