如何在彩盒周围放置框架？

Question

我想在我的颜色框周围放一个细框，以显示白色。

\documentclass[11pt]{article}
\usepackage{xcolor}
\newcommand\crule[3][black]{\textcolor{#1}{\rule{#2}{#3}}}
\begin{document}
    \crule[gray]{5cm}{5cm} \crule[white]{5cm}{5cm} \crule{5cm}{5cm}
\end{document}

我该怎么做？

Answer 1

\documentclass[11pt]{article}
\usepackage{xcolor}
\newcommand\crule[3][black]{{\setlength{\fboxsep}{0pt}\fbox{\textcolor{#1}{\rule{#2}{#3}}}}}

\begin{document}
    \crule[gray]{5cm}{5cm} \crule[white]{5cm}{5cm} \crule{5cm}{5cm}

\end{document}