html, body {
  height: 100%;
  margin: 0;
}

body {
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  background: #000000;
  display: -webkit-flex;
  display: flex;
}

/* general form styling */
.container {
  margin: 0 auto;
}