# How to make longtable width to textwidth?

I am trying to center a side longtable using \makebox[\textwidth]{ it worked for a normal table.

\documentclass[a4paper]{article}
\usepackage{array}
\usepackage{longtable}
\usepackage{lipsum}

\begin{document}
\lipsum[1]

\noindent\makebox[\textwidth]{
\begin{longtable}
{>{\centering\arraybackslash}m{0.55\textwidth} >{\centering\arraybackslash}m{0.55\textwidth}}
\lipsum[2] & \lipsum[3] \
\end{longtable}
}

\lipsum[4]
\end{document}

I use sharelatex and get the error Missing \endgroup inserted..

edit: I saw How to fit landscape multi-page table to textwidth but LTcapwidth didn't help

• as you see this does not work at all for longtable, but it is not a good way to center a tabular either, better to use \centering (longtables are by default, so there is nothing to do in that case) – David Carlisle Jul 11 '18 at 11:51
• your title asks about making a table full width but the text of your question asks about centreing, which do you want to do? If something is full width then centering is a no-op, longtables are centred by default, the posted answers show how to make it full width. – David Carlisle Jul 11 '18 at 11:53

longtable has its own method for this:

\documentclass[a4paper]{article}
\usepackage{array}
\usepackage{longtable}
\usepackage{lipsum}

\begin{document}
\lipsum[1]

\begingroup % localize the following settings
\setlength{\LTleft}{0pt minus 1000pt}
\setlength{\LTright}{0pt minus 1000pt}

\begin{longtable}{
>{\centering\arraybackslash}m{0.55\textwidth}
>{\centering\arraybackslash}m{0.55\textwidth}
}
\lipsum[2] & \lipsum[3]
\end{longtable}
\endgroup

\lipsum[4]
\end{document}

\documentclass[a4paper]{article}
\usepackage{xltabular}
\usepackage{lipsum}

\begin{document}
\lipsum[1]

\begingroup % localize the following settings
\setlength\LTleft{0pt minus 1000pt}
\setlength\LTright{0pt minus 1000pt}
\renewcommand\tabularxcolumn[1]{m{#1}}

\begin{xltabular}{1.1\linewidth}{>{\centering}X>{\centering}X}
\lipsum[2] & \lipsum[3]
\end{xltabular}
\endgroup

\lipsum[4]
\end{document}