.login_bg {
    position: absolute;
    background-image: url("/img/bg.png");
    background-position: center; /* Center the image */
    background-repeat: no-repeat; /* Do not repeat the image */
    -o-background-size: cover !important;
    background-size: cover !important;
    -webkit-background-size: cover !important;
    -moz-background-size: cover;
    height: 100%;
}
h4 {
    margin: 10px 20px;
}
/*body{height:100vh;*/
/*    box-sizing:border-box;*/
/*    overflow-y:hidden;}*/

@media (max-width: 768px) {
    body {
        height:100vh;
    }
}