\begin{overpic}[width=0.49\textwidth]{tour8} \put(1,74){\colorbox{white}{(\sublabel{tour8}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114062733-568157}{tour8}}} %%(\subref{tour8}) \href{tour8} \color{red} \end{overpic}