Use material theme

shell.nix

@@ -6,6 +6,13 @@ pkgs.mkShell {
   buildInputs = [
     pkgs.python312
     pkgs.nodePackages.vscode-json-languageserver
+    pkgs.cairo
     pkgs.uv
   ];
+  LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath [
+    pkgs.cairo
+    pkgs.pango
+    pkgs.gdk-pixbuf
+    pkgs.libffi
+  ];
 }