.outer {
    display: table;
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
  }
  
  .middle {
    display: table-cell;
    vertical-align: middle;
  }
  
  .inner {
    color: #32CD32;
    margin-left: 20%;
    margin-right: auto;
    display: inline-block;
    padding: 30px;
    /* Whatever width you want */
  }

body {
    background-image: linear-gradient(#202020 0%, #101010 2%);
}