Consider the following table.
Code
\documentclass{article}
\usepackage{booktabs,dcolumn}
\usepackage[table]{xcolor}
\newcolumntype{d}[1]{D{.}{,}{#1}}
\newcommand*\mc[1]{\multicolumn{1}{c}{#1}}
\newcommand*\farve[1]{\cellcolor{blue!50}#1}
\begin{document}
\begin{tabular}{d{2.0} d{2.0} d{2.0} d{2.0} d{2.0} d{2.0} d{2.0}}
\toprule
\mc{Mandag} & \mc{Tirsdag} & \mc{Onsdag} & \mc{Torsdag} & \mc{Fredag} & \mc{L{\o}rdag} & \mc{S{\o}ndag} \\
\midrule
& & & & & 1 & 2 \\
3 & 4 & 5 & 6 & 7 & 8 & 9 \\
10 & \farve{11} & \farve{12} & 13 & 14 & 15 & 16 \\
17 & \farve{18} & \farve{19} & 20 & 21 & 22 & 23 \\
24 & 25 & 26 & 27 & 28 & 29 & 30 \\
31 & & & & & & \\
\bottomrule
\end{tabular}
\end{document}
Output
Question
How do I color the entire rectangle with the numbers 11, 12, 18, and 19? As can be seen, where is a thin white space between the indiviual cells.
