\usepackage {color}
\definecolor{Light}{gray}{.80}
\definecolor{Dark}{gray}{.20}
\colorbox{red}{Black text on red background}
\par\colorbox{Light}{%
\textcolor{Dark}{Light background}}
\par\colorbox{Dark}{%
\textcolor{white}{Dark background}}
Generated by dwww version 1.15 on Thu Jun 20 22:55:37 CEST 2024.