Creating a diagonal line/section/border with 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>