refactored css, including some markup changes

app/templates/downloadButton/index.js

@@ -0,0 +1,15 @@
+const html = require('choo/html');
+
+module.exports = function(state, emit) {
+  function download(event) {
+    event.preventDefault();
+    emit('download', state.fileInfo);
+  }
+
+  return html`
+  <div>
+    <button class="btn btn--download"
+      onclick=${download}>${state.translate('downloadButtonLabel')}
+    </button>
+  </div>`;
+};