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For multiline text, wrap the tip text into a \parbox of given width: \tooltip****{foo}{\parbox{0.8\linewidth}{... long text ...}} For rounded corners, replace \fcolorbox in the tooltip code with, e. g., \tcbox from package tcolorbox %\fcolorbox{black}{#7}{#8}% \tcbox[colframe=black,colback=#7,size=fbox,arc=1ex]{#8}% \documentclass{article} %%%%%...


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