html {
    height: 100%;
}

body {
    background-image: url("ricc-01a_09.jpg");
    min-height: 100%;
    background-size: cover;
    background-position: center top;
    display: flex;
    align-items: center;
    justify-content: center;
}

.form-box
{
    padding: 2.5em;
    text-align: center;
    background-color: white;
}