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Commits (2)
\tikzstyle{commit}=[draw,circle]
\begin{tikzpicture}[scale=0.7]
\node[commit, fill=green!60] (C1)at(0,4){C1};
\node[commit, fill=green!60] (C2)at(0, 6){C2};
\node[commit, fill=green!60] (C3)at(0, 8){C3};
\node[commit, fill=green!60] (C2)at(0, 6){C2};
\node[commit, fill=green!60] (C1)at(0,4){C1};
\draw[->, >=latex] (C2) -- (C1) ;
\draw[->, >=latex] (C3) -- (C2) ;
\end{tikzpicture}