CSS Triangle


You can make them with a single div. It’s nice to have classes for each direction possibility.

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


The idea is a box with zero width and height. The actual width and height of the arrow is determined by the width of the border. In an up arrow, for example, the bottom border is colored while the left and right are transparent, which forms the triangle.

.arrow-up {
        width: 0;
        height: 0;
        border-left: 5px solid transparent;
        border-right: 5px solid transparent;

        border-bottom: 5px solid black;

.arrow-down {
        width: 0;
        height: 0;
        border-left: 20px solid transparent;
        border-right: 20px solid transparent;

        border-top: 20px solid #f00;

.arrow-right {
        width: 0;
        height: 0;
        border-top: 60px solid transparent;
        border-bottom: 60px solid transparent;

        border-left: 60px solid green;

.arrow-left {
        width: 0;
        height: 0;
        border-top: 10px solid transparent;
        border-bottom: 10px solid transparent; 

        border-right:10px solid blue;


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s