body, html {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  font-family: Arial, sans-serif;
  color: #fff;
  background: #000;
}

.header {
  display: table;
  width: 100%;
  height: 100%;
}

a.center {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
  color: #fff;
  text-decoration: none;
  letter-spacing: 2px;
}


a img {
  margin-top: 15px;
}