LaTeX Colorful Box: \colorbox, \fcolorbox, and tcolorbox environment

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\documentclass[varwidth]{standalone}
\standaloneconfig{border=2em}

\usepackage{xcolor}
\usepackage[most]{tcolorbox}

\begin{document}

\colorbox{yellow}{yellow box}

\fcolorbox{black}{green}{green box with black border}

\begin{tcolorbox}[colback=red!20,
                  colframe=black,
                  width=7cm,
                  arc=1mm, auto outer arc]
red box with black round border
\end{tcolorbox}

\begin{tcolorbox}[enhanced jigsaw,
                  colback=blue!50,% background
                  colframe=black,% border color
                  drop shadow={black!50!gray!80},
                  boxrule=1pt, % border width
                  width=10cm,
                  arc=1mm, auto outer arc]
blue box with black-shadow round border
\end{tcolorbox}

\end{document}