[Tex/LaTex] Center text in color box

colorhorizontal alignment

I wanto to center a text in a colorbox which is scaled horicontal over the complete site.

enter image description here

How is this possible?

\documentclass[
]{scrreprt}

\usepackage[
]{scrpage2}

\usepackage[ngerman]{babel}                 %% Deutsches Sprachpaket
\usepackage[utf8]{inputenc}                 %% Eingabezeichensatz UTF-8
\usepackage[T1]{fontenc}                    %% Kodierung für Umlaute
\usepackage[ngerman]{translator}            %% Für Abkürzungsverzeichnis benötigt
\usepackage{lmodern}                        %% Moderne Version von Computer Modern
\usepackage{setspace}                       %% Zeileabstand anpassen
\usepackage{xcolor}                         %% Definieren von Farben

\begin{document}

\chapter{}
\definecolor{lightgray}{gray}{0.5}
\newcommand \colbox [1]{\par\noindent\colorbox{gray}{\begin{minipage}{\textwidth}{ {#1}} \hfill \end{minipage}}}

\colbox{TEXT}

\end{document}

Moreover I want to avoid the overfull hbox.

Best Answer

You need a full width \parbox after taking account the padding added by \colorbox:

\noindent
\colorbox{grey}{\parbox{\dimexpr\textwidth-2\fboxsep}{\centering
 hello
}}
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