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I'd like to put a box on top of some latex page (in my particular case, a slide of a beamer presentation), as indicated in the picture below. How do I achieve this in latex, preferable in a way where I just give absolute coordinates for the box, and not put the page in the background as a second argument.

enter image description here

EDIT: Ok, the tikz overlay option seems to do exactly what I want. I.e. adding 

\begin{tikzpicture}[overlay]
\node[draw, fill=white, thick,minimum width=6cm,minimum height=4cm] (b) at (-4,0){Box with some content};
\end{tikzpicture}}

to the page frame seems to solve the problem. I'll add this as an answer once I'm sure I won't run into unexpected behaviour.

Roman Bruckner
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  • Could you please give us a starting point? A short example (maybe 20 to 40 lines) of a beamer presentation lacking your desired overlay box should suffice. – Henri Menke Sep 14 '16 at 09:21
  • Yeah, I could. But the solution should be independent of the content of the slide. Just put a box on top of the current content of the slide, as shown on the Image, that I can hide/unhide using \only<>{}. – Roman Bruckner Sep 14 '16 at 17:52
  • The tikzpagenodes will allow you to place a box (called a node in tikz) anywhere of the page relative to points like (current page text area.center). You may have to fill the node with white first. – John Kormylo Sep 14 '16 at 19:56

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