Beamer The Metropolis differenziare colori sfondo titolo/testo

Buongiorno a tutti/e,

sto facendo una presentazione con il template “the metropolis” di beamer. In questo template il titolo delle slide è bianco su uno sfondo colorato. Il colore di questo sfondo è lo stesso del testo delle slide.

Ora, il mio problema è il seguente: vorrei cambiare il colore dello sfondo del titolo ma non del testo, che mi piace così com’è. Ho fatto diverse prove definendo un nuovo colore, ma riesco solo a cambiarli entrambi 🙁 Qualcuno/a può aiutarmi, per favore? Copio sotto il codice del foglio di stile relativo ai colori (non riesco ad allegarlo perché l’estensione non è tra quelle supportate).

Grazie in anticipo!

Martina
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%%
%% This is file `beamercolorthememetropolis.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% beamercolorthememetropolis.dtx (with options: `package')
%% —————————————————————————
%% Copyright 2015 Matthias Vogelgesang and the LaTeX community. A full list of
%% contributors can be found at
%%
%% https://github.com/matze/mtheme/graphs/contributors
%%
%% and the original template was based on the HSRM theme by Benjamin Weiss.
%%
%% This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
%% International License (https://creativecommons.org/licenses/by-sa/4.0/).
%% —————————————————————————
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{beamercolorthememetropolis}[2017/01/23 Metropolis color theme]
\RequirePackage{pgfopts}
\pgfkeys{
/metropolis/color/block/.cd,
.is choice,
transparent/.code=\metropolis@block@transparent,
fill/.code=\metropolis@block@fill,
}
\pgfkeys{
/metropolis/color/background/.cd,
.is choice,
dark/.code=\metropolis@colors@dark,
light/.code=\metropolis@colors@light,
}
\newcommand{\metropolis@color@setdefaults}{
\pgfkeys{/metropolis/color/.cd,
background=light,
block=transparent,
}
}
\definecolor{mDarkBrown}{HTML}{604c38}
\definecolor{mDarkTeal}{HTML}{23373b}
\definecolor{mLightBrown}{HTML}{EB811B}
\definecolor{mLightGreen}{HTML}{14B03D}
\newcommand{\metropolis@colors@dark}{
\setbeamercolor{normal text}{%
fg=black!2,
bg=mDarkTeal
}
\usebeamercolor[fg]{normal text}
}
\newcommand{\metropolis@colors@light}{
\setbeamercolor{normal text}{%
fg=mDarkTeal,
bg=black!2
}
}
\setbeamercolor{alerted text}{%
fg=mLightBrown
}
\setbeamercolor{example text}{%
fg=mLightGreen
}
\setbeamercolor{titlelike}{use=normal text, parent=normal text}
\setbeamercolor{author}{use=normal text, parent=normal text}
\setbeamercolor{date}{use=normal text, parent=normal text}
\setbeamercolor{institute}{use=normal text, parent=normal text}
\setbeamercolor{structure}{use=normal text, fg=normal text.fg}
\setbeamercolor{palette primary}{%
use=normal text,
fg=normal text.bg,
bg=normal text.fg
}
\setbeamercolor{frametitle}{%
use=palette primary,
parent=palette primary
}
\setbeamercolor{progress bar}{%
use=alerted text,
fg=alerted text.fg,
bg=alerted text.fg!50!black!30
}
\setbeamercolor{title separator}{
use=progress bar,
parent=progress bar
}
\setbeamercolor{progress bar in head/foot}{%
use=progress bar,
parent=progress bar
}
\setbeamercolor{progress bar in section page}{
use=progress bar,
parent=progress bar
}
\newcommand{\metropolis@block@transparent}{
\setbeamercolor{block title}{%
use=normal text,
fg=normal text.fg,
bg=
}
\setbeamercolor{block body}{
bg=
}
}
\newcommand{\metropolis@block@fill}{
\setbeamercolor{block title}{%
use=normal text,
fg=normal text.fg,
bg=normal text.bg!80!fg
}
\setbeamercolor{block body}{
use={block title, normal text},
bg=block title.bg!50!normal text.bg
}
}
\setbeamercolor{block title alerted}{%
use={block title, alerted text},
bg=block title.bg,
fg=alerted text.fg
}
\setbeamercolor{block title example}{%
use={block title, example text},
bg=block title.bg,
fg=example text.fg
}
\setbeamercolor{block body alerted}{use=block body, parent=block body}
\setbeamercolor{block body example}{use=block body, parent=block body}
\setbeamercolor{footnote}{fg=normal text.fg!90}
\setbeamercolor{footnote mark}{fg=.}
\setbeamercolor{bibliography entry author}{fg=, bg=}
\setbeamercolor{bibliography entry title}{fg=, bg=}
\setbeamercolor{bibliography entry location}{fg=, bg=}
\setbeamercolor{bibliography entry note}{fg=, bg=}
\metropolis@color@setdefaults
\ProcessPgfPackageOptions{/metropolis/color}
\mode
\endinput
%%
%% End of file `beamercolorthememetropolis.sty'.`