beamercolorbox with transparency creates a darker horizontal line

Asked Aug 22 '16 at 20:14

Active Jul 23 '20 at 13:40

Viewed 260 times

I try to make a transparent beamercolorbox (or any transparent box) but always get a horizontal line that is a bit darker than the rest of the box. Is there a way to get it to go away? I took the example from Where can I find beamercolorbox options defined? and adapted to

    \documentclass[dvipsnames]{beamer}
    \usetheme{Copenhagen}
    \setbeamercolor{mycolor}{fg=RoyalBlue,bg=red}
    \begin{document}
       \begin{frame}
       \pgfsetfillopacity{0.5}
       \begin{beamercolorbox}[wd=0.5\paperwidth,ht=2.5ex,dp=1.125ex,rounded=true]{mycolor}%
        colored text
        \end{beamercolorbox}%
        \end{frame}
\end{document}

But I get a box that looks like this

How do I get rid of the red horizontal line at the top of the box?

edited Jul 23 '20 at 13:40

marli

asked Aug 22 '16 at 20:14

user2306488

1

Have a look at http://tex.stackexchange.com/questions/317489/untitled-block-transparency-beamer – samcarter_is_at_topanswers.xyz Aug 22 '16 at 20:17
if you need to create boxes have a look at the tcolorbox package too, which offers much more flexibility than a beamercolorbox – d-cmst Aug 22 '16 at 20:28

beamercolorbox with transparency creates a darker horizontal line

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