I am making a presentation in beamer and I need to superimpose a diagram in a slide (on top of everything) something like this: first slide diagram superpose



Welcome to TeX-SE! With TikZ that's straightforward.

\foreach \X in {1,...,90} {Example }
\begin{tikzpicture}[overlay,remember picture]
\fill[gray,opacity=0.2] (current page.south west) 
rectangle (current page.north east) 

enter image description here

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