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adapts stylefiles based on the snippets in

Add this to the beamerthemetuhh.sty file:

\makeatletter
\setbeamertemplate{theorem begin}
{%
\begin{\inserttheoremblockenv}
{%
\inserttheoremheadfont
\ifx\inserttheoremaddition\@empty\else\ \inserttheoremaddition\fi%
}%
}
\setbeamertemplate{theorem end}{\end{\inserttheoremblockenv}}
\makeatother

Add this to the beamercolorthemetuhh.sty file:

\setbeamercolor{block title}{use=structure,fg=white,bg=tuhhTeal}
\setbeamercolor{block body}{parent=normal text,use=block title,bg=white}

Add this to the beamerfontthemetuhh.sty file:

\setbeamerfont{block body}{size=\fontsize{20pt}{7.5mm}, series=\fontfamily{poppins}}

Use in your document as:

\begin{theorem}[Cooperative Data Exchange (CDE)]
    A CDE Problem consists of a set of nodes and a set of information chunks.\\
    At the start of a CDE process each node only holds a subset of information chunks.\\
    At the end of a CDE process each node should hold \textbf{all} information chunks.
\end{theorem}