html,
body {
    height: 100%;
}

.login-background {
    height: 100%;
    background: url(/assets/img/Coverages-Section-Background-2.jpg);
    background-position: center;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}