\bigskip
\noindent
 \begin{minipage}[t]{\textwidth}
\begin{tabularx}{\textwidth}{|X|X|X|}
\hline
\relax  head  &  head2  &  head3  \\
\hline
\relax  body  &   &    \\
\relax  body  &   &    \\
\hline
\relax  foot  &   &    \\
\hline
\end{tabularx}
\end{minipage}
\bigskip