QFD2/QFluentWidgets/qss/dark/check_box.qss

CheckBox {
    color: white;
    font: 14px 'Segoe UI', 'Microsoft YaHei';
    spacing: 8px;
    min-width: 28px;
    min-height: 20px;
}

CheckBox::indicator {
    width: 18px;
    height: 18px;
    border-radius: 5px;
    border: 1px solid rgb(159, 159, 159);
    background-color: rgb(42, 42, 42);
}

CheckBox::indicator:hover {
    border: 1px solid rgb(161, 161, 161);
    background-color: rgb(56, 56, 56);
}

CheckBox::indicator:pressed {
    border: 1px solid rgb(86, 86, 86);
    background-color: rgb(62, 62, 62);
}

CheckBox::indicator:checked,
CheckBox::indicator:indeterminate {
    background-color: --ThemeColorPrimary;
    border: 1px solid --ThemeColorPrimary;
}

CheckBox::indicator:checked {
    image: url(:/qfluentwidgets/images/check_box/Accept_black.svg);
}

CheckBox::indicator:indeterminate {
    image: url(:/qfluentwidgets/images/check_box/PartialAccept_black.svg);
}

CheckBox::indicator:checked:hover,
CheckBox::indicator:indeterminate:hover {
    border: 1px solid --ThemeColorDark1;
    background-color: --ThemeColorDark1;
}

CheckBox::indicator:checked:pressed,
CheckBox::indicator:indeterminate:pressed {
    border: 1px solid --ThemeColorDark2;
    background-color: --ThemeColorDark2;
}

CheckBox:disabled {
    color: rgba(255, 255, 255, 110);
}

CheckBox::indicator:disabled {
    border: 1px solid rgb(82, 82, 82);
    background-color: rgb(45, 45, 45);
}

CheckBox::indicator:checked:disabled,
CheckBox::indicator:indeterminate:disabled {
    border: 1px solid rgb(82, 82, 82);
    background-color: rgb(82, 82, 82);
}