body, html {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  background: #222;
  color: #444;
  height: 100%;
  margin: 0;
}

#wrapper {
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  min-height: 100%;
}

.center {
  margin: 0 auto;
  text-align: center;
}