CSS: Hive Berlin Maintainance Page

maintainance.css

html {
  height: 100%;
  padding: 0;
  margin: 0;
}
body {
  min-height: 100%;
  padding: 0;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font: 14px/1.4 'Open Sans', 'Helvetica Neue', Helvetica, Arial, Sans-Serif;
  background: #fff;
  color: #aaa;
}
header {
  text-align: center;
  max-width: 50%;
}
header img {
  max-width: 30em;
  margin: 0 0 0 0;
}
header h1 {
  font-weight: normal;
  font-size: 1.4em;
}
header h2 {
  font-weight: 300;
  font-size: 2.28em;
}