demo.css

/**
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt

*/
body {
  font-family: 'Roboto', 'Noto', sans-serif;
  font-size: 14px;
  margin: 0;
  padding: 24px;
}

section {
  padding: 20px 0;
}

section > div {
  padding: 14px;
  font-size: 16px;
}