body {
  background-image: url(http://blog.thornyeternity.com/wp-content/uploads/2012/05/tile-arabesques-dark-preview.jpg);
}

.content {
  margin: 10px;
}

.status {
  color: white;
  font-size: 18px;
}

.ghost {
  color: cyan;
  display:inline;
}

.code {
  color: gray;
  display:inline;
}

#envelope{
  height:400px;
}

.center {
     float: none;
     margin-left: auto;
     margin-right: auto;
}

.vertical-center {
  min-height: 100%;  /* Fallback for browsers do NOT support vh unit */
  min-height: 100vh; /* These two lines are counted as one :-)       */

  display: flex;
  align-items: center;
}