\begin{overpic}[width=0.49\textwidth]{tour-40} \put(1,74){\colorbox{white}{(\sublabel{tour-40}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114060836-061554}{tour-40}}} %%(\subref{tour-40}) \href{tour-40} \color{red} \end{overpic}