CSS | Type: CSSPure CSS triangle

Creates a triangle shape with nothing but CSS. Note that the border placement and color dictates triangle color and direction of pointer (opposite the visible border).

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;
}