data/QObject.qss

QLabel#notice {
    font-size: 20px;
    color: gray;
    border: 1px solid gray;
    border-radius: 8px;
}
QLabel#notice[notice_level="normal"] {
    color: green;
    border-color: green;
}
QLabel#notice[notice_level="warning"] {
    color: yellow;
    border-color: yellow;
}
QLabel#notice[notice_level="error"] {
    color: red;
    border-color: red;
}