@media screen and (min-width: 768px) {
        .modal-dialog {
          width: 700px; /* New width for default modal */
        }
        .modal-sm {
          width: 550px; /* New width for small modal */
        }
    }
    @media screen and (min-width: 992px) {
        .modal-lg {
          width: 950px; /* New width for large modal */
        }
    }
    
    @media (min-width: 576px) {
        .modal-sm {
            max-width: 500px;
            margin: 20% auto;
        } 
    }