@media (max-width: 480px) {
    .modal.fade.in {
        top: 10px;
        position: fixed; 
        top: 3%; 
        right: 3%; 
        left: 3%; 
        bottom: 3%; 
        width: auto; 
        margin: 0; 
    }
    .modal-body { 
        height: 60%; 
    }
}