refactored css, including some markup changes

app/pages/notFound/index.js

@@ -0,0 +1,19 @@
+const html = require('choo/html');
+const assets = require('../../../common/assets');
+
+module.exports = function(state) {
+  const div = html`
+    <div class="notFoundPage">
+      <div class="title">${state.translate('expiredPageHeader')}</div>
+      <div class="notFoundPage__img">
+        <img src="${assets.get('illustration_expired.svg')}" id="expired-img">
+      </div>
+      <div class="description">
+        ${state.translate('uploadPageExplainer')}
+      </div>
+      <a class="link link--action" href="/">
+        ${state.translate('sendYourFilesLink')}
+      </a>
+    </div>`;
+  return div;
+};