.login-page {
    position: relative;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.login-page {
    background-image: url('https://suivi.couleursduweb.com/assets/uploads/backgrounds/a14d94931b0c19576fa57cf8bf346efa.jpg');
    height: 100%;
}