Snugshade size limiting

Question

Im trying to limit the area that is turned black with my code to just the one line i have text in insted of the now three. But latex is hard i guess.

\documentclass[a4paper, 11pt]{article}
\usepackage{comment} % enables the use of multi-line comments (\ifx \fi) 
\usepackage{fullpage} % changes the margin
\usepackage[swedish]{babel}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{multicol}
\usepackage{xcolor}
\usepackage{framed}
\definecolor{shadecolor}{RGB}{0,0,0}
\usepackage{float}
\usepackage{fancyhdr}
\usepackage{enumitem}
\pagestyle{fancy} 
\usepackage{pdfpages}
\usepackage{multicol}
%\usepackage[head=128pt]{geometry}
\title{\textsc{Extra Curricular Achievements}}
\author{Erik Jonasson}
\usepackage{geometry}
\setlength{\footskip}{0.1pt}
\setlength{\headheight}{80pt}
\setlength{\topmargin}{0pt}
\setlength\parindent{0pt}
\usepackage{titlesec} 
\begin{document}

\newcommand\FUM{5} 


\begin{snugshade*}
    \noindent\textsc{\section*{\begin{tabular}{c|c}
    \color{white}{F18-{\FUM}.1} 
    & \color{white}{Formalia} 
\end{tabular}}}
\end{snugshade*}
\end{document}

Answer 1

In case you don't want to use KOMA classes, you can try some variants with snugshade. First the original, then without the noindent and smallcaps (which did not work anyway), then with the snugshade within the section, and finally with the snugshade in the section and without the tabular.

\documentclass[a4paper, 11pt]{article}

\usepackage[table]{xcolor}
\usepackage{tabularx}
\usepackage{framed}
\definecolor{shadecolor}{RGB}{0,0,0}
\usepackage{titlesec} 
\begin{document}

\begin{snugshade}
    \noindent\textsc{\section*{\begin{tabular}{c|c}
    \color{white}{F18-5.1} 
    & \color{white}{Formalia} 
\end{tabular}}}
\end{snugshade}

\begin{snugshade}
\section*{\begin{tabular}{c|c}
    \color{white}{F18-5.1} 
    & \color{white}{Formalia} 
\end{tabular}}
\end{snugshade}

\section*{\begin{snugshade}\begin{tabular}{c|c}
    \color{white}{F18-5.1} 
    & \color{white}{Formalia} 
\end{tabular}\end{snugshade}\vspace{-1cm}}
abc

\section*{\begin{snugshade}\color{white}F18-5.1\quad Formalia\end{snugshade}}

\end{document}

Result:

Note the \vspace{-1cm} in the third variant, for some reason this option takes a lot of vertical space which needs to be corrected a bit.