try postcss-purgecss

Author: aminya

.postcssrc

@@ -0,0 +1,9 @@
+{
+  "plugins": {
+    "@fullhuman/postcss-purgecss": {
+      content: ["./index.html", "src/**/*.js"],
+      css: ["./styles/style.css"],
+      safelist: []
+    }
+  }
+}

package-lock.json

@@ -32,10 +32,10 @@
     "@babel/core": "7.11.4",
     "@babel/plugin-proposal-optional-chaining": "7.11.0",
     "@babel/plugin-syntax-dynamic-import": "7.8.3",
+    "@fullhuman/postcss-purgecss": "^3.0.0",
     "babel-preset-solid": "0.19.0",
     "bootstrap": "^4.5.2",
     "parcel": "^2.0.0-beta.1",
-    "parcel-plugin-purgecss": "^3.0.0",
     "serve": "^11.3.2"
   },
   "targets": {