I am using Beamer with the fonttheme structureitalicserif. I would like to have the same font in my tcolorbox titles. I haven't been able to find anything in the manuals nor online. Is this possible? How?
\documentclass{beamer}
\usefonttheme{structureitalicserif}
\usepackage{tcolorbox}
\tcbset{fonttitle=\itshape\rmfamily}
\begin{document}
\begin{frame}
\frametitle{title}
\begin{block}{title}
content...
\end{block}
\begin{tcolorbox}[title=foo]
content...
\end{tcolorbox}
\end{frame}
\end{document}