Css hsla

/* HSLA (Hue Saturation Lightness Alpha) */
hsl(240, 100%, 50%, 50%)
/* First value: Angle of the color Ciricle */
/* Second Value: Saturation. */
/* Third Value is Lightness. 0% Is black, 100% is white */
/* Fourth value is the Alpha Value */

/* !!! Not tp be mistaken with hsl, which doesn't have the alpha setting */

Source: quackit.com

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