\begin{overpic}[width=0.49\textwidth]{tour-36}
\put(1,74){\colorbox{white}{(\sublabel{tour-36}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114055950-126800}{tour-36}}}
%%(\subref{tour-36}) \href{tour-36}
\color{red}
\end{overpic}