.bd-example-modal-lg .modal-dialog {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    margin: 0;
}

.bd-example-modal-lg .modal-content {
    background-color: transparent;
    border: none;
    box-shadow: none;
}