html,
body {
  margin: 0;
  width: 100%;
  height: 50%;
}

.container {
  display: block;
  width: 100%;
  height: 400px;
}

.form-container {
  margin: 3em;
  display: block;
}

.spacer {
  margin-top: 2em;
  margin-left: 3em;
}