Have the same size on all my boxes

Question

I currently use this code to create my boxes :

\documentclass[12pt,a4paper,french]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{tcolorbox}
\newtcolorbox{mybox}[1][]{before=\centering, hbox, drop fuzzy shadow, enhanced}
\tcbuselibrary{skins}

\begin{document}
\begin{large}
\begin{flushleft}

gfdsgsdgsd gdssssssssssssssssssssssssssffffgdsffffffffffffffffffffffffffff\\
\vspace{5mm}
\begin{mybox}
$\begin{aligned}
a\leq b \Leftrightarrow ac \leq bc
\end{aligned}$
\end{mybox}

gfdsgsdgsd gdssssssssssssssssssssssssssffffgdsffffffffffffffffffffffffffff\\
\vspace{5mm}
\begin{mybox}
$\begin{aligned}
1+1=2
\end{aligned}$
\end{mybox}

gfdsgsdgsd gdssssssssssssssssssssssssssffffgdsffffffffffffffffffffffffffff\\
\vspace{5mm}
\begin{mybox}
$\begin{aligned} 
gdssssssssssssssssssssssss
\end{aligned}$
\end{mybox}

\end{flushleft}
\end{large}
\end{document}

I'd like all my boxes to be the width of my biggest box.

How can I do that? thank you

Answer 1

You can do that very easily with the eqparbox package (two compilations are necessary):

\documentclass[12pt,a4paper,french]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{eqparbox}
\usepackage{tcolorbox}
\newtcolorbox{mybox}[1][]{before=\centering, hbox, drop fuzzy shadow, enhanced}
\tcbuselibrary{skins}

\begin{document}

\begin{large}
\begin{flushleft}

gfdsgsdgsd gdssssssssssssssssssssssssssffffgdsffffffffffffffffffffffffffff\\
\vspace{5mm}
\begin{mybox}
\eqmakebox[M]{$\begin{aligned}
a\leq b \Leftrightarrow ac \leq bc
\end{aligned}$}
\end{mybox}

gfdsgsdgsd gdssssssssssssssssssssssssssffffgdsffffffffffffffffffffffffffff\\
\vspace{5mm}
\begin{mybox}
\eqmakebox[M]{$\begin{aligned}
1+1=3
\end{aligned}$}
\end{mybox}

gfdsgsdgsd gdssssssssssssssssssssssssssffffgdsffffffffffffffffffffffffffff\\
\vspace{5mm}
\begin{mybox}
\eqmakebox[M]{$\begin{aligned}
gdssssssssssssssssssssssss
\end{aligned}$}
\end{mybox}

\end{flushleft}
\end{large}

\end{document}