\begin{overpic}[width=0.49\textwidth]{tour-05}
\put(1,74){\colorbox{white}{(\sublabel{tour-05}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114024726-774682}{tour-05}}}
%%(\subref{tour-05}) \href{tour-05}
\color{red}
\end{overpic}