30-seconds-of-code/snippets/triangle.md

Triangle

Creates a triangle shape with pure CSS.

HTML

<div class="triangle"></div>

CSS

.triangle {
  width: 0;
  height: 0;
  border-top: 20px solid #333;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
}

Demo

<style> .snippet-demo__triangles { display: flex; align-items: center; } .snippet-demo__triangle { display: inline-block; width: 0; height: 0; margin-right: 0.25rem; } .snippet-demo__triangle-1 { border-top: 20px solid #333; border-left: 20px solid transparent; border-right: 20px solid transparent; } .snippet-demo__triangle-2 { border-bottom: 20px solid #333; border-left: 20px solid transparent; border-right: 20px solid transparent; } .snippet-demo__triangle-3 { border-left: 20px solid #333; border-top: 20px solid transparent; border-bottom: 20px solid transparent; } .snippet-demo__triangle-4 { border-right: 20px solid #333; border-top: 20px solid transparent; border-bottom: 20px solid transparent; } .snippet-demo__triangle-5 { border-top: 40px solid #333; border-left: 15px solid transparent; border-right: 15px solid transparent; } </style>

Explanation

View this link for a detailed explanation.

The color of the border is the color of the triangle. The side the triangle tip points corresponds to the opposite border-* property. For example, a color on border-top means the arrow points downward.

Experiment with the px values to change the proportion of the triangle.

Browser support

✅ No caveats.