initial push

themes/mushroom/mushroom.yaml

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+# DO NOT EDIT THIS FILE.
+# This file will be reset with updates.
+# If you want to customize it, copy the content in another folder and file and change the name.
+# https://www.home-assistant.io/integrations/frontend/#defining-themes
+Mushroom:
+    # Nothing here as it's the default HA theme since 2022.11
+    modes:
+        light: {}
+        dark: {}