\begin{overpic}[width=0.49\textwidth]{tour8}
\put(1,74){\colorbox{white}{(\sublabel{tour8}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114062733-568157}{tour8}}}
%%(\subref{tour8}) \href{tour8}
\color{red}
\end{overpic}