Add dark theme from https://tex.stackexchange.com/a/57478

README.md

@@ -14,3 +14,4 @@ Options disponible :
 
 - `code` : utilisation de `minted`
 - `fr` : utilisation de `babel`
+- `dark` : thème sombre

projektor.sty

@@ -7,6 +7,8 @@
 \DeclareOption{code}{\option@codetrue}
 \newif\ifoption@fr
 \DeclareOption{fr}{\option@frtrue}
+\newif\ifoption@dark
+\DeclareOption{dark}{\option@darktrue}
 
 \ProcessOptions
 \ifoption@code
@@ -25,6 +27,21 @@
     numbering=fraction
 ]{metropolis}
 
+
+\ifoption@dark
+    % Dark theme
+    \setbeamercolor{normal text}{fg=white,bg=black!90}
+    \setbeamercolor{structure}{fg=white}
+
+    \setbeamercolor{alerted text}{fg=red!85!black}
+    \setbeamercolor{item projected}{use=item,fg=black,bg=item.fg!35}
+
+    \setbeamercolor*{palette primary}{use=structure,fg=structure.fg}
+    \setbeamercolor*{palette secondary}{use=structure,fg=structure.fg!95!black}
+    \setbeamercolor*{palette tertiary}{use=structure,fg=structure.fg!90!black}
+    \setbeamercolor*{palette quaternary}{use=structure,fg=structure.fg!95!black,bg=black!80}
+\fi
+
 % Footer
 \setbeamertemplate{frame footer}{
     \insertsection \hfill\hspace{-4em} \insertshorttitle