\begin{overpic}[width=0.49\textwidth]{tour10}
\put(1,74){\colorbox{white}{(\sublabel{tour10}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114063330-114995}{tour10}}}
%%(\subref{tour10}) \href{tour10}
\color{red}
\end{overpic}