\[\begin{bmatrix}\begin{array}{cc}\ce{H\phantom{…………}}\ce{H}\\
|\phantom{………….}|\\\ce{- C – C = C – C -}\\
|\phantom{…..}|\phantom{….}|\phantom{….}|\\
\ce{H\phantom{…}} \ce{CH3\phantom{..}} \ce{H\phantom{…}} \ce{H}\end{array}\end{bmatrix}\]