Simple box in beamer

Question

I'm looking for a beamer theme with a simple box around each frame. Just a coloured rectangle, really. I tried to frame each slide myself with tcolorbox, but I can only make it start below the frame title. How would I go about making a box like the one in the picture below? Or is there a preset theme that I haven't found yet?

Ignasi · Accepted Answer

Following code could be a solution. It draws a rectangular TikZ node in background. You have to compile twice to see the rectangular border.
documentclass{beamer}
usepackage{tikz}
setbeamertemplate{background canvas}{%
    begin{tikzpicture}[remember picture, overlay]%
    node[draw=blue, thick, minimum width=.975paperwidth, minimum height=.95paperheight] at (current page.center){};
    end{tikzpicture}}
    
begin{document}
begin{frame}{Testing Background Image}
    Hello!
end{frame}
end{document}

Simple box in beamer

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