add themes

package.json

@@ -9,12 +9,14 @@
     "content-type-parser": "^1.0.2",
     "copy-to-clipboard": "^3.3.1",
     "history": "^5.0.0",
+    "local-storage": "^2.0.0",
     "pako": "^2.0.3",
     "prismjs": "^1.23.0",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "react-scripts": "4.0.3",
-    "react-simple-code-editor": "^0.11.0"
+    "react-simple-code-editor": "^0.11.0",
+    "styled-components": "^5.2.1"
   },
   "scripts": {
     "start": "react-scripts start",