Style ScrollBar separately in fallback

internal/styles/fallback/wintergreen.go

@@ -263,6 +263,65 @@ rules := []style.Rule {
 		tomo.ATexture(textureHandleHorizontal),
 	), tomo.R("", "SliderHandle"), "horizontal"),
 
+	// *.Scrollbar
+	style.Ru(style.AS (
+		tomo.AttrBorder {
+			outline,
+			tomo.Border {
+				Width: tomo.I(1, 0, 0, 1),
+				Color: borderColorEngraved,
+			},
+		},
+		tomo.AttrColor { Color: colorGutter },
+		tomo.AttrPadding(tomo.I(0, 1, 1, 0)),
+	), tomo.R("", "Scrollbar")),
+	
+	// *.Scrollbar[focused]
+	style.Ru(style.AS (
+		tomo.ABorder (
+			outline,
+			tomo.Border {
+				Width: tomo.I(1),
+				Color: borderColorFocused,
+			}),
+		tomo.APadding(0),
+	), tomo.R("", "Scrollbar"), "focused"),
+	
+	// *.Scrollbar[horizontal]
+	style.Ru(style.AS (
+		tomo.AMinimumSize(48, 0),
+	), tomo.R("", "Scrollbar"), "horizontal"),
+	
+	// *.Scrollbar[vertical]
+	style.Ru(style.AS (
+		tomo.AMinimumSize(0, 48),
+	), tomo.R("", "Scrollbar"), "vertical"),
+
+	// *.ScrollbarHandle
+	style.Ru(style.AS (
+		tomo.ABorder (
+			outline,
+			tomo.Border {
+				Width: tomo.I(1),
+				Color: borderColorLifted,
+			},
+			tomo.Border {
+				Width: tomo.I(1),
+				Color: [4]color.Color {
+					tomo.ColorRaised, tomo.ColorRaised,
+					tomo.ColorRaised, tomo.ColorRaised,
+				},
+			}),
+		tomo.AColor(nil),
+		tomo.ATexture(textureHandleVertical),
+		tomo.AMinimumSize(12, 12),
+	), tomo.R("", "ScrollbarHandle")),
+
+	// *.ScrollbarHandle[horizontal]
+	style.Ru(style.AS (
+		tomo.ATexture(textureHandleHorizontal),
+	), tomo.R("", "ScrollbarHandle"), "horizontal"),
+
 	// *.ScrollContainer
 	style.Ru(style.AS (
 		tomo.AGap(0, 0),