Color modes (#1181)

tailwind.config.js

@@ -7,8 +7,10 @@
 module.exports = {
   future: {
     removeDeprecatedGapUtilities: true,
+    purgeLayersByDefault: true,
   },
   experimental: "all",
+  dark: "class",
   corePlugins: {
     clear: false,
     float: false,
@@ -26,7 +28,6 @@ module.exports = {
         errColor: "var(--err-color)",
         acColor: "var(--ac-color)",
         actColor: "var(--act-color)",
-        atcColor: "var(--atc-color)",
         ttColor: "var(--tt-color)",
       },
       inset: {},