\begin{overpic}[width=0.49\textwidth]{tour-33}
\put(1,74){\colorbox{white}{(\sublabel{tour-33}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114055538-334848}{tour-33}}}
%%(\subref{tour-33}) \href{tour-33}
\color{red}
\end{overpic}