А вот и наглядное использование контроля стилей через свойства виджета. Билиотека qt-material.
В этом разделе написано, что через свойство class можно контролировать цвет кнопки, по аналогии с css стилями.
btn_danger.setProperty('class', 'danger')
btn_warning.setProperty('class', 'warning')
btn_success.setProperty('class', 'success')
#libs#qt
Not all carbon is the same - some heats the planet, others help #cool it.
1/. Black Carbon – Soot from incomplete combustion; strong warming effect
2/. Brown Carbon – Biomass smoke aerosols; absorbs sunlight
3/. Blue Carbon – Stored in coastal & marine ecosystems
4/. Green Carbon – Stored in forests, soils, and vegetation
5/. Red Carbon – Biological matter on snow & ice; accelerates melting
6/. Grey Carbon – Fossil fuel–based industrial emissions
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