Margin problem with enumitem

Question

I'm using enumitem to have a custom enumeration like this :

Step 1 : first step

Step 2 : second step

I looked up this answer, and adapted it :

\begin{enumerate}[label=\bfseries Step \arabic*:]
    \item Elliptic Key Creation :
    \item Exchange of Public Elliptic keys
    \item MasterSecret Computation
\end{enumerate}

Up to now it's okay.

I now have a margin problem. The text after the \item doesn't shift to the right, and so, as the Step X : is longer than a simple -, the Step X : appears in the margin, like this :

Is there a way to shift this of the length of the \item text ?

Answer 1

Use leftmargin=*

\documentclass{article}
\usepackage{enumitem}
\usepackage{showframe}
\begin{document}
  \begin{enumerate}[label=\bfseries Step \arabic*:,leftmargin=*]
    \item Elliptic Key Creation :
    \item Exchange of Public Elliptic keys
    \item MasterSecret Computation
\end{enumerate}
\end{document}

Or set a proper itemindent if you want to control the indent.

\documentclass{article}
\usepackage{enumitem}
\usepackage{showframe}
\begin{document}
  \begin{enumerate}[label=\bfseries Step~\arabic*:,itemindent=3em]
    \item Elliptic Key Creation : 
    \item Exchange of Public Elliptic keys
    \item MasterSecret Computation
\end{enumerate}
\end{document}