html, body {
  height: 100%;
}

body {
  display: flex;
  color: #fff;
  background-size: cover;
  background-image: url('../images/bg-login.png');
}

.form-signin {
  width: 100%;
  padding: 15px;
  margin: auto;
  background-color: #555;
  max-width: 400px !important;
}