OSCC · CSS, Visual · Oct 13, 2021

Creates a triangular shape with pure CSS.

  • Use three borders to create a triangle shape.
  • All borders should have the same border-width (20px).
  • The opposite side of where the triangle points towards (i.e. top if the triangle points downwards) should have the desired border-color. The adjacent borders (i.e. left and right) should have a border-color of transparent.
  • Altering the border-width values will change the proportions of the triangle.
<div class="triangle"></div>
.triangle {
  width: 0;
  height: 0;
  border-top: 20px solid #9C27B0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;

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