main.css

/**
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

html, body {
  font-family: 'Roboto', 'Helvetica', sans-serif;
}
body {
  width: 400px;
  min-height: 400px;
  margin: 0;
  padding: 5px;
}
a {
  text-decoration: none;
}
li a {
  text-decoration: underline;
  color: #0288d1;
}
.mdl-grid {
  max-width: 1024px;
  margin: auto;
}
.mdl-layout__header-row {
  padding: 0;
}
.quickstart-user-details-container {
  margin-top: 20px;
  line-height: 25px;
}
#quickstart-sign-in-status {
  font-weight: bold;
}
pre {
  overflow-x: scroll;
  line-height: 18px;
}
code {
  white-space: pre-wrap;
  word-break: break-all;
}

.loader {
  border: 16px solid #f3f3f3;
  border-radius: 50%;
  border-top: 16px solid grey;
  width: 120px;
  height: 120px;
  -webkit-animation: spin 2s linear infinite; /* Safari */
  animation: spin 2s linear infinite;
  margin:0 auto;
}
@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
#loading {
  text-align:center;
}
#fail-state{
  display:none;
}

#myProgress {
  width: 100%;
  background-color: lightgray;
}
#myBar {
  width: 0%;
  height: 30px;
  background-color: #4CAF50;
  text-align: center; /* To center it horizontally (if you want) */
  line-height: 30px; /* To center it vertically */
  color: white; 
}