\begin{overpic}[width=0.49\textwidth]{tour-34}
\put(1,74){\colorbox{white}{(\sublabel{tour-34}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114055653-356730}{tour-34}}}
%%(\subref{tour-34}) \href{tour-34}
\color{red}
\end{overpic}