Rewrote Header to a function

prosjekt2/src/App.js

 import React from 'react';
 import MiddlePart from './components/MiddlePart';
-import Header from './components/header';
+import Header from './components/Header';
 import './App.css';
 
 function App() {

prosjekt2/src/components/header.jsx

-import React, {Component} from 'react';
+import React from 'react';
 
-class Header extends Component {
-      render() {
-        return (
-          <div className="header" id="header"
-            ref={a => this._acc = a} >
-                Awesome art collections!
-          </div>
-        )
-      }
+function Header(){
+  return (
+    <div className="header" id="header">
+          Awesome art collections!
+    </div>
+  )
 }
 
 export default Header;