hsla()

The hsla() color function defines the color value by providing three comma separated values with an optional fourth value.

• The first value represents the hue value, the base of the color.
• The second represents the saturation value.
• The third represents the luminance value.
• The optional fourth value represents the alpha value, which is the transparency of the color.

Syntax

<property>: hsla(hue, saturation, luminance, alpha);

• hue: A unitless number value. The base of the color. Represents an angle in the color wheel from 0 to 360.
• saturation: A percentage value. Represents the saturation of the base color. 0% represents a color with no saturation at all and it shows gray. 100% means the base color is full.
• luminance: A percentage value. Represents the brightness of the base color. 0% represents a color with no luminance at all and it shows black. 100% means full lightness and it shows white. 50% means the base color is full.
• alpha: A numeric value between 0 and 1. A 1 value will make the color fully opaque, while a 0 value will make the color fully transparent.

Example 1

Set the font color of the h1 element to a shade of purple with an alpha of 0.5:

h1 {
  color: hsla(270, 50%, 40%, 0.5);
}

Example 2

Set the font color of the h2 element:

h1 {
  color: hsla(211, 60%, 10%, 0.8);
}