Added user button and menu.

components/Icon.js

@@ -2,6 +2,16 @@ import React from 'react';
 import classNames from 'classnames';
 import styles from './Icon.module.css';
 
-export default function Icon({ icon, className }) {
-  return <div className={classNames(styles.icon, className)}>{icon}</div>;
+export default function Icon({ icon, className, size = 'M' }) {
+  return (
+    <div
+      className={classNames(styles.icon, className, {
+        [styles.large]: size === 'L',
+        [styles.medium]: size === 'M',
+        [styles.small]: size === 'S',
+      })}
+    >
+      {icon}
+    </div>
+  );
 }