@media (max-width: 768px) {
    .modal {
        position: fixed;
    top: 14px;
    bottom: auto;
 
    }
}
 
@media (max-width: 768px) {
    .modal-body {
        position: relative;
        padding: 12px;
        height: 52vh;
        overflow-y: scroll;
    }
}