added common font size in global scss and imported it in app module.scss

src/App.module.scss

@@ -1,3 +1 @@
-.App {
-  text-align: center;
-}
+@import './common/styles/global.scss';

src/App.tsx

@@ -3,7 +3,7 @@ import styles from './App.module.scss';
 
 function App() {
   return (
-    <div className={styles.App}>
+    <div>
 
     </div>
   );

src/common/styles/global.scss

@@ -0,0 +1,8 @@
+@import './colors.scss';
+
+* {
+    padding: 0;
+    margin: 0;
+    box-sizing: border-box;
+    font-size: 62.5%;
+}