Name: How to create triangles in CSS
Rating: 1.4 (1109 reviews)
Author: jetthoughts-dev

How to create triangles in CSS

JetThoughts Dev - Jul 22 '22 -

- Dev Community

In this post, we are going to see a simple method to draw a triangle in CSS using borders.

<div class="triangle-up"></div>
<div class="triangle-down"></div>
<div class="triangle-left"></div>
<div class="triangle-right"></div>

Triangle Up

Triangle is one of the simplest shapes in geometry. It can be drawn with just three straight lines and a couple of angles.

Set a width and height of 0.
Set the border color to transparent.
Set the top border to 0.
Set the side borders to half the width.
Set the bottom border to have the full height.
Set a color for the bottom border.

.triangle-up {
  width: 0; 
  height: 0; 
  border-left: 15px solid transparent;
  border-right: 15px solid transparent; 
  border-bottom: 15px solid red;
}

Triangle Down

.triangle-down {
  width: 0; 
  height: 0; 
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-top: 15px solid blue;
}

Triangle Left

.triangle-left {
  width: 0; 
  height: 0; 
  border-top: 15px solid transparent;
  border-bottom: 15px solid transparent; 
  border-right: 15px solid yellow; 
}

Triangle Right

.triangle-right {
  width: 0; 
  height: 0; 
  border-top: 15px solid transparent;
  border-bottom: 15px solid transparent;
  border-left: 15px solid green;
}