hsla() CSS Function


The hsla() CSS function is used to set a color value in CSS. The hsla() function takes four values, they are: hue, saturation, lightness and alpha transparency.


hsl() = hsl( <hue>, <saturation>, <lightness>,  <alpha>)


  • huerepresents an angle of the color circle. You can specify the value as an angle in degrees (e.g. 180deg) or simply as a number (e.g. 180). For example, blue is at 240 degrees, so it could be written as either 240deg or 240. By definition, red=0°=360°, with the other colors spread around the circle, so green=120°, blue=240°, etc.
  • saturationsaturation is expressed as a percentage. It represents the amount of saturation in the color. For example, 100% is fully saturated (more colorful and intense), while 0 is a fully-unsaturated gray.
  • lightnesslightness is also expressed as a percentage. It represents the amount of light in the color. For lightness, 50% is the "normal" setting, while 100% is white and 0% is black.
  • alphadetermines how transparent the color is. A value of 1 is fully opaque, while a value of 0 is fully transparent. A value of 0.5 is semi-transparent.


<div class='hsla'>This is an example of the hsla() function.</div>
body {
background: url("images/tick.png");
.hsla {
background-color: hsla(240, 100%, 50%, 0.5);
color: white;
border: 2px solid red;
margin: 20px;
padding: 20px;
text-align: center;

Browser Support

Explorer Edge Chrome Firefox Opera Safari
Tablets / Mobile
Android Chrome Firefox Opera Safari Samsung

Last updated by CSSPortal on: 1st December 2019