How to make half-square background in css

Tags: css,css-shapes

Problem :

square cut in half diagonaly

Is it possible to make in pure css background for half square like on the image. I know that it can be done with an image as background, but I need to use 5 different colours, and maybe in future the colours can be changed.

Solution :

If your divs have fixed sizes, you can use borders to make two triangles as described in How do CSS triangles work?:

  border-top:100px solid red;
  border-right:100px solid grey;

To make other sizes, colors, you need to tweak the border properties :

div {
  display: inline-block;
div:nth-child(1) {
  border-right: 100px solid red;
  border-top: 100px solid grey;
div:nth-child(2) {
  border-left: 100px solid red;
  border-top: 100px solid grey;
div:nth-child(3) {
  border-right: 50px solid red;
  border-top: 100px solid grey;
div:nth-child(4) {
  border-right: 100px solid red;
  border-bottom: 50px solid grey;

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