I use this code for a metropolis beamer presentation (thanks to a user here!)
\documentclass{beamer}
\usetheme{metropolis}
\definecolor{myblue}{RGB}{76,138,225}
\setbeamercolor{palette primary}{bg=myblue}
\setbeamercolor{structure}{fg=myblue}
\setbeamercolor{block title}{fg=red,bg=lightgray!50}
\setbeamercolor{block body}{bg=lightgray!25}
\setbeamercolor{progress bar in section page}{fg=myblue}
\setbeamercolor{titlelike}{fg=orange}
\setbeamertemplate{itemize items}[triangle]
% ----------------------------------------------------------
% Einstellungen Titelfolien
\title{Aufbau von tragfähigen Grundvorstellungen zu diskreten Zufallsvariablen}
\subtitle{Untertitel zu bestimmen}
% \date{\today}
\author{author}
\date{date}
\begin{document}
\maketitle
\begin{frame}
\frametitle{title}
abc
\begin{definition}[test]
content...
\end{definition}
\begin{itemize}
\item test
\end{itemize}
\end{frame}
\section{title}
\end{document}
It produces a orange bar on the titlepage. Does anyone know how to change the color to blue? See in the picture, I wish the line to be blue.

