#tabWidget { background-color: #333; } * { font-size: <font-size>px; } SettingsDialogTab:hover { border: 1px solid grey; } QLabel, QCheckBox, QGroupBox, SettingsDialogTab { color: white; } QGroupBox { background-color: #444; } QCheckBox::indicator { width: <checkbox-size>px; height: <checkbox-size>px; }