\begin{overpic}[width=0.49\textwidth]{tour3} \put(1,74){\colorbox{white}{(\sublabel{tour3}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114061130-907780}{tour3}}} %%(\subref{tour3}) \href{tour3} \color{red} \end{overpic}