HEGII.ss.mes.check/wwwroot/Plugins/bootstrap-4.3.1/css/bootstrap4-modal-fullscreen.css

.modal.modal-fullscreen .modal-dialog {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    max-width: none;
}

.modal.modal-fullscreen .modal-content {
    height: auto;
    height: 100vh;
    border-radius: 0;
    border: none;
}

.modal.modal-fullscreen .modal-body {
    overflow-y: auto;
}