\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}