notebook {
			transition: background 0.5s ease;
			/*-gtk-key-bindings: NewTab;*/
		}
		notebook.header {
			border: none;
		}
		button, entry {
			border-radius: 20px;
			margin-right: 5px;
			margin-left: 5px;
		}
		
		.titlebutton.close:hover {
			background: red;
			transition: background 0.3s ease;
		}
		.titlebutton.close {
			transition: background 0.3s ease;
		}