You can play with the optional arguments of \colorcolumn
. For the umlauts problem, a simple \extrarowheight
will do. I took the liberty of changing the input encoding to utf8
, which is understood by all OSes and modern editors.
\documentclass{article}
% For "Umlauts"
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[
a4paper,
margin = 5mm,
landscape,
%showframe,
]
{geometry}
% Table stuff
\usepackage{tabularx}
% Loads also "colortbl"
\usepackage[table]{xcolor}
% Nice sans serif font :)
\usepackage[sfdefault]{cabin}
\begin{document}
\noindent\setlength\extrarowheight{3pt}
\begin{tabularx}{\textwidth}{@{}>{\columncolor{blue!25}[0pt][\tabcolsep]}l|>{\columncolor{blue!25}}l|X|X@{}}
\hline
\rowcolor{white}Übung & Parameter & \\
\hline
Color Cell & Color Cell & & \\
\hline
\end{tabularx}
\end{document}
\setlength{\extrarowheight}{2pt}
cellcolor{<some color>}
and the cell's contents. Your screenshot shows the result of not adhering to this recommendation...