cellcolor 在多列的右侧留下空白

Question

代码：

\documentclass[11pt]{article}

\usepackage{xcolor}
\usepackage{array}
\usepackage{colortbl}
\usepackage{multirow}
\usepackage{makecell}

\renewcommand\arraystretch{1.5}

\begin{document}

\begin{center}
    \begin{tabular}{|>{\columncolor[gray]{0.9}\raggedleft\arraybackslash}m{6cm}|>{\centering\arraybackslash}m{6cm}|}
        \hline
        \multicolumn{2}{|m{12cm}|}{\cellcolor{cyan!40}\Large\textbf{The
        quick brown fox jumps over the lazy dog. The quick brown fox
        jumps over the lazy dog}}\\\hline
        First & Value 1\\\hline
        Second & Value 2\\\hline
        Third & Value 3\\\hline
    \end{tabular}
\end{center}

\end{document}

问题是我无法消除右边的空白：

Answer 1

您的多列跨度不如其跨越的列宽，颜色只是使其更清晰

使用\multicolumn{2}{|m{\dimexpr 12cm+2\tabcolsep+\arrayrulewidth }|}，以便它跨越柱间材料