\begin{overpic}[width=0.49\textwidth]{tour-35} \put(1,74){\colorbox{white}{(\sublabel{tour-35}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114055849-665390}{tour-35}}} %%(\subref{tour-35}) \href{tour-35} \color{red} \end{overpic}