html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
  background: #1a1a1a;
}

.form-signin {
    width: 100%;
    margin: auto;
}

.background-image {
    max-width: 560px;
    overflow: clip;
}

.background-image img {
    border-radius: 15px;
    height: 500px;
    width: 550px;
}

.signup-form {
    padding: 25px;
    color: white;
    background: #2a2a2a;
    border-radius: 15px;
    height: 500px;
    width: 550px;
    overflow: auto;
}

.signup-form .form-control {
    background: #333;
    border: 1px solid #444;
    color: white;
}

.btn-red {
    background-color: #ff3366;
    border-color: #ff3366ac;
}

.btn-red:hover, .btn-red:active, .btn-red:focus {
    background-color: #fe1650;
    border-color: #ff245bac;
}