html,
body {
    height: 100%;
}

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

.form-signin {
    width: 100%;
    max-width: 420px;
    padding: 15px;
    margin: auto;
}

.form-signin .card {
    border: 0;
    box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.12);
}