Hot answers tagged color
2
For such a color box problem I would recommend a color box package like mdframed or tcolorbox.
A tcolorbox solution would be:
\usepackage{tcolorbox}% preamble AFTER \usepackage[usenames,dvipsnames]{color}
...
\newcommand{\headergrey}[1]{%
\begin{tcolorbox}[enlarge left by=-15pt,width=\linewidth+15pt,
...
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