hsla() CSS Function

Description

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.

Syntax

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

Values

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.

Example

HTML

<div class='hsla'>This is an example of the hsla() function.</div>

CSS

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;

}

Result