Creating a diagonal line/section/border with CSS - css

Question

I am trying to create a diagonal line on a webpage, to act as a section/section break. This is essentially a split colour section. I cant use an image as if the page gets enlarged, the image is going to pixelate. So i need to be able to draw a diagonal line directly at the bottom of the div, like the image below.
I have tried using a border, however i cannot get the actual break to be in the middle, rather than the right or left hand side.
Is there a way to draw diagonal lines in CSS? As you can see, i need to create a div that is 90px high and have the split/diagonal line in that div. I can then have a look at adding the image, but the main issue is not knowing whether this is possible with CSS.

Answer 1

With an svg, it is pretty simple :
svg {
display: block;
width: 100%;
height: 90px;
background: yellow;
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 10" preserveAspectRatio="none">
<polygon points="100 0 100 10 0 10" />
</svg>
Note that I used the preserveAspectRatio="none" attribute so that the shape can have 100% width and keep 90px height
And here with a monkey image :
div {
position: relative;
}
svg {
display: block;
width: 100%;
height: 90px;
background: yellow;
}
img {
height: 50px;
position: absolute;
top: 0; bottom: 0;
left: 0; right: 0;
margin: auto;
background: #fff;
border-radius: 50%;
padding: 10px;
}
<div>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 10" preserveAspectRatio="none">
<polygon points="100 0 100 10 0 10" />
</svg>
<img src="http://images.clipartpanda.com/monkey-clipart-black-and-white-16981-monkey-face-svg.svg" alt="" />
</div>

Answer 2

You can do this without any clipping and just using borders in a unique way. This should also be cross-browser compatible, but I haven't tested it across everything
Initially divided this into 2 separate divs / triangles and joined them, but thanks to web-tiki and kaiido perfected it to use only 1 div and minimal CSS
*{
border: 0;
padding: 0;
margin: 0;
}
#gradient {
width: 0;
height: 0;
border-style: solid;
border-width: 90px 100vw 0 0;
border-color: yellow black transparent transparent;
transform: scale(1.0001);
}
<div id="gradient"></div>
Original Answer using multiple divs:
*{
border: 0;
padding: 0;
margin: 0;
}
#container {
width: 100%;
position: relative;
}
#container div {
position: absolute;
}
#top-triangle {
width: 0;
height: 0;
border-style: solid;
border-width: 90px 100vw 0 0;
border-color: yellow transparent transparent transparent;
}
#bottom-triangle {
width: 0;
height: 0;
border-style: solid;
border-width: 0 0 90px 100vw;
border-color: transparent transparent black transparent;
}
<div id="container">
<div id="top-triangle"></div>
<div id="bottom-triangle"></div>
</div>

Answer 3

Use a linear gradient
div {
height: 90px;
background-image: linear-gradient(to bottom right, yellow, yellow 50%, black 50%, black);
}
<div></div>

Answer 4

You can use CSS3 clip:
.yellow {
width: 100%;
height: 90px;
background: yellow;
-webkit-clip-path: polygon(100% 0, 0 0, 0 100%);
clip-path: polygon(100% 0, 0 0, 0 100%);
}
.black {
width: 100%;
height: 90px;
background: black;
-webkit-clip-path: polygon(100% 0, 0 100%, 100% 99%);
clip-path: polygon(100% 0, 0 100%, 100% 99%);
margin-top: -90px;
}
<div class="yellow"></div>
<div class="black"></div>
Demo: http://jsfiddle.net/zLkrfeev/2/
It's not widely supported by the browsers: http://caniuse.com/#feat=css-clip-path

Answer 5

if you want to put diagonal border in column you can do it this way and its 100% responsive. your requirement might be different though. I put it transparent image which contains white diagonal border in that section's right column.
<div id="wrapper">
<div class="h-row">
<div class="h-left">
</div>
<div class="h-right">
<div class="hr-box"></div>
</div>
</div>
</div>
<style>
.h-row{display: table; table-layout: fixed; height: 100%; width: 100%;}
.h-left,
.h-right{display: table-cell; vertical-align: top; height:250px;}/*height is just for demo purpose you can remove it ofcourse and fill the content */
.h-left{background: #e9eae2; padding: 50px 83px 15px 165px; width: 69%;}
.h-right{background: #7acec3 url('https://previews.dropbox.com/p/thumb/AAMv9WREPIx2AXUVhzCrK5Hl1jxf3ofX0teck9P94bG_SCjB28QPmKqXuchYyjp_xFMjMrGLzRYHh0O9wBOZJMZW9L_97lScKB22dgco9eGMJ1PCBbFepUcDkPg3aUE_1ONik2rKQ2SgRvtUgdq8nA_Ev1gxLxq8yWcXNKOdxKGBNOqe4FTHnbAgGy-JD4UtwZliw8c0fmNah8rydlD4JetFxNubkUyW4I_Q-XRL5qjW9A/p.png?size=1280x960&size_mode=3') no-repeat center center/ 100% 100%; padding: 50px 165px 15px 0; width: 31%; position: relative;}
.h-left .row{margin:0 -44px;}
</style>
https://codepen.io/neel555nc/pen/LgjoOg

Answer 6

You can do this using a gradient.
body {
height: 200px;
margin: 0 0 20px 0;
background-color: transparent;
background-size: 20px 20px;
background-image:
-webkit-repeating-linear-gradient(-45deg, black, black 1px, transparent 1px, transparent 14px);
background-image:
-moz-repeating-linear-gradient(-45deg, black, black 1px, transparent 1px, transparent 14px);
background-image:
-o-repeating-linear-gradient(-45deg, black, black 1px, transparent 1px, transparent 14px);
background-image:
repeating-linear-gradient(-45deg, black, black 1px, transparent 1px, transparent 14px);
}
JSFiddle