I want to have this result: The first column in grey and the second color is white:

Two columns page with two colors

I am using \usepackage{multicol}.


your question isn't so vivid, but I prefer tikz and atbegshi.



 \begin{tikzpicture}[remember picture, overlay]
    \draw [fill=gray, opacity=.3] (\marginparwidth-\marginparsep, -\headheight-\headsep) rectangle 

enter image description here

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