diff --git a/internal/theme/default/style.go b/internal/theme/default/style.go
index 7015127..f9b1644 100644
--- a/internal/theme/default/style.go
+++ b/internal/theme/default/style.go
@@ -9,6 +9,7 @@ import dataTheme "git.tebibyte.media/tomo/nasin/internal/theme"
 var colorFocus         = color.RGBA { R:  61, G: 128, B: 143, A: 255 }
 var colorInput         = color.RGBA { R: 208, G: 203, B: 150, A: 255 }
 var colorCarved        = color.RGBA { R: 151, G: 160, B: 150, A: 255 }
+var colorGutter        = color.RGBA { R: 116, G: 132, B: 126, A: 255 }
 var colorShadow        = color.RGBA { R:  57, G:  59, B:  57, A: 255 }
 var colorInputShadow   = color.RGBA { R: 143, G: 146, B:  91, A: 255 }
 var colorHighlight     = color.RGBA { R: 207, G: 215, B: 210, A: 255 }
@@ -113,6 +114,22 @@ var rules = []dataTheme.Rule {
 		),
 	},
 
+	// *.Container[sunken]
+	dataTheme.Rule {
+		Role: theme.R("", "Container", "sunken"),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1, 0, 0, 1),
+					Color: borderColorEngraved,
+				},
+			},
+			dataTheme.AttrColor { Color: theme.ColorSunken },
+			dataTheme.AttrPadding(tomo.I(8)),
+		),
+	},
+
 	// *.Container[outer]
 	dataTheme.Rule {
 		Role: theme.R("", "Container", "outer"),
@@ -154,7 +171,7 @@ var rules = []dataTheme.Rule {
 					Color: borderColorEngraved,
 				},
 			},
-			dataTheme.AttrColor { Color: theme.ColorSunken },
+			dataTheme.AttrColor { Color: colorGutter },
 			dataTheme.AttrPadding(tomo.I(0, 1, 1, 0)),
 		),
 		Focused: dataTheme.AS (