jellyfin-web/dashboard-ui/bower_components/emby-webcomponents/prompt/style.css

.promptDialog {
    flex-direction: column;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.txtPromptValue label {
    font-size: 200%;
}

.promptDialogContent {
    text-align: left;
    padding: 1em 2em;
    margin: 0 !important;
}

.promptDialog.fullscreen .promptDialogContent {
    padding: 0;
    width: 50%;
}

.promptDialog.fullscreen .btnSubmit {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: center;
}

.promptDialog.fullscreen .btnPromptExit {
    z-index: 1002;
    position: absolute;
    top: .5em;
    left: .5em;
}

    .promptDialog.fullscreen .btnPromptExit i {
        width: 4.4vh;
        height: 4.4vh;
        font-size: 4.4vh;
    }