Upgrade tailwindcss to v3 and dependencies; migrate config file

package.json

@@ -75,10 +75,10 @@
   },
   "devDependencies": {
     "@vitejs/plugin-react": "^2.0.0",
-    "autoprefixer": "^9.8.8",
-    "postcss": "^7.0.39",
+    "autoprefixer": "^10.4.8",
+    "postcss": "^8.4.16",
     "source-map-explorer": "^2.5.2",
-    "tailwindcss": "npm:@tailwindcss/postcss7-compat@^2.2.6",
+    "tailwindcss": "^3.1.8",
     "vite": "^3.0.4",
     "vite-plugin-compression": "^0.5.1"
   }

tailwind.config.js

@@ -10,8 +10,7 @@ function withOpacity(variableName) {
 }
 
 module.exports = {
-  purge: ["./src/**/*.{js,jsx,ts,tsx}", "./index.html"],
-  darkMode: false, // or 'media' or 'class'
+  content: ["./src/**/*.{js,jsx,ts,tsx}", "./index.html"],
   theme: {
     extend: {
       colors: {
@@ -53,12 +52,5 @@ module.exports = {
       },
     },
   },
-  variants: {
-    extend: {
-      cursor: ["disabled"],
-      backgroundColor: ["disabled"],
-      textColor: ["disabled"],
-    },
-  },
   plugins: [],
 };