\begin{overpic}[width=0.49\textwidth]{tour-14} \put(1,74){\colorbox{white}{(\sublabel{tour-14}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20210114025806-020820}{tour-14}}} %%(\subref{tour-14}) \href{tour-14} \color{red} \end{overpic}