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RGB colors are the standard for web pages. Here I test several syntaxes of them, including the one with an alpha channel.
With a hexadecimal value.
background-color: #cb000f
color: #cb000f
border-color: #cb000f;
With an rgb() value with integers.
background-color: rgb(203,0,15)
color: rgb(203,0,15)
border-color: rgb(203,0,15);
With an rgb() value with percentages.
background-color: rgb(79%,0%,6%)
color: rgb(79%,0%,6%)
border-color: rgb(79%,0%,6%)
With an rgba() value with integers.
background-color: rgba(203,0,15,0.6)
color: rgba(203,0,15,0.6)
border-color: rgba(203,0,15,0.6)
With an rgba() value with percentages.
background-color: rgba(79%,0%,6%,0.6)
color: rgba(79%,0%,6%,0.6)
border-color: rgba(79%,0%,6%,0.6)