Better themeing support!!

app/javascript/themes/default/theme.yml

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+#  (REQUIRED) Name must be unique across all installed themes.
+name: default
+
+#  (REQUIRED) The location of the pack file inside `pack_directory`.
+pack: application.js
+
+#  (OPTIONAL) The directory which contains the pack file.
+#  Defaults to the theme directory (`app/javascript/themes/[theme]`).
+pack_directory: app/javascript/packs

app/javascript/themes/spin/pack.js

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+import 'packs/application';
+import 'themes/spin/style';

app/javascript/themes/spin/style.scss

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+:root:root:root {
+  .button, .icon-button, .emoji-button, .account__avatar, .account__avatar-overlay {
+    animation: spin 4s linear infinite;
+  }
+}
+
+@keyframes spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

app/javascript/themes/spin/theme.yml

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+name: spin
+pack: pack.js