\begin{table}[H]
   \caption{Available Source Control Systems}
   \vspace{-15pt}
\end{table}

\small{\begin{tcolorbox}[tabularx={p{0.25\textwidth}|X}]
      \textbf{Product}
      &

      \textbf{URL}
      \\ \hline
      \hline
      RCS
      &

      \url{https://www.gnu.org/software/rcs/}
      \\ \hline

      CVS
      &

      \url{https://www.nongnu.org/cvs}
      \\ \hline

      Subversion
      &

      \url{https://subversion.apache.org}
      \\ \hline

      git
      &

      \url{https://www.kernel.org/pub/software/scm/git/}
      \\ \hline

      GNU Arch
      &

      \url{https://www.gnu.org/software/gnu-arch}
      \\ \hline

      Monotone
      &

      \url{https://www.monotone.ca}
      \\ \hline

      Mercurial
      &

      \url{https://www.mercurial-scm.org}
   \end{tcolorbox}}

