app/css/style.css

   1
   2 html, body {
   3     width: 100%;
   4     height: 100%;
   5     padding: 0;
   6     margin: 0;
   7 }
   8
   9 .wrapper {
  10     display: table;
  11     width: 100%;
  12     height: 100%;
  13 }
  14
  15 .content {
  16     display: table-cell;
  17     width: 100%;
  18     height: 100%;
  19     text-align: center;
  20     vertical-align: middle;
  21 }
  22
  23 pre {
  24     margin: auto;
  25     text-align: left;
  26     width: 400px;
  27 }