CSS: Style buttons with 'disabled' class

src/styles/base.sass

@@ -784,6 +784,17 @@ button, .btn
 	&-info
 		+button($color-info, $color-info, false)
 
+
+	&.disabled
+		+button($color-background-dark, $color-background, false)
+		background-color: $color-background-light !important
+		border-color: $color-background-dark !important
+		color: $color-text !important
+		opacity: .5 !important
+		pointer-events: none !important
+		text-shadow: none !important
+		user-select: none !important
+
 .input-group-flex
 	display: flex