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* { engine: none; border-radius: 0; border-style: none; border-image: none; background-image: none; } GtkWindow { background-color: green; } GtkButton { background-color: black; border-style: solid; border-color: rgba(255,0,0,0.6); border-width: 4; } #reference { border-color: rgb(153,102,0); }