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Similar to rgb() notation, but with an additional alpha (opacity) value.


rgba(<red>, <green>, <blue>, <alpha>)

value Description
<red> an integer from 0 - 255 or percentage from 0 - 100%
<green> an integer from 0 - 255 or percentage from 0 - 100%
<blue> an integer from 0 - 255 or percentage from 0 - 100%
<alpha> a number from 0 - 1, where 0.0 is fully transparent and 1.0 is fully opaque


.red {
 /* Opaque red */
 background-color: rgba(255, 0, 0, 1);

.red-50p {
 /* Half-translucent red. */
 background-color: rgba(255, 0, 0, .5);


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