diff --git a/packages/frontend/src/components/MkContainer.vue b/packages/frontend/src/components/MkContainer.vue
index a6372b7b6f..1b62a697e2 100644
--- a/packages/frontend/src/components/MkContainer.vue
+++ b/packages/frontend/src/components/MkContainer.vue
@@ -185,7 +185,6 @@ export default defineComponent({
 	left: 0;
 	color: var(--panelHeaderFg);
 	background: var(--panelHeaderBg);
-	border-bottom: solid 0.5px var(--panelHeaderDivider);
 	z-index: 2;
 	line-height: 1.4em;
 }
diff --git a/packages/frontend/src/themes/_dark.json5 b/packages/frontend/src/themes/_dark.json5
index a23d25e866..aea8148209 100644
--- a/packages/frontend/src/themes/_dark.json5
+++ b/packages/frontend/src/themes/_dark.json5
@@ -27,7 +27,6 @@
 		panelHighlight: ':lighten<3<@panel',
 		panelHeaderBg: ':lighten<3<@panel',
 		panelHeaderFg: '@fg',
-		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		panelBorder: '" solid 1px var(--divider)',
 		acrylicPanel: ':alpha<0.5<@panel',
 		windowHeader: ':alpha<0.85<@panel',
diff --git a/packages/frontend/src/themes/_light.json5 b/packages/frontend/src/themes/_light.json5
index 713756221a..a8b5489671 100644
--- a/packages/frontend/src/themes/_light.json5
+++ b/packages/frontend/src/themes/_light.json5
@@ -27,7 +27,6 @@
 		panelHighlight: ':darken<3<@panel',
 		panelHeaderBg: ':lighten<3<@panel',
 		panelHeaderFg: '@fg',
-		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		panelBorder: '" solid 1px var(--divider)',
 		acrylicPanel: ':alpha<0.5<@panel',
 		windowHeader: ':alpha<0.85<@panel',
diff --git a/packages/frontend/src/themes/d-astro.json5 b/packages/frontend/src/themes/d-astro.json5
index c6a927ec3a..86a8403bb4 100644
--- a/packages/frontend/src/themes/d-astro.json5
+++ b/packages/frontend/src/themes/d-astro.json5
@@ -57,7 +57,6 @@
 		listItemHoverBg: 'rgba(255, 255, 255, 0.03)',
 		scrollbarHandle: 'rgba(255, 255, 255, 0.2)',
 		wallpaperOverlay: 'rgba(0, 0, 0, 0.5)',
-		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		scrollbarHandleHover: 'rgba(255, 255, 255, 0.4)',
 		X2: ':darken<2<@panel',
 		X3: 'rgba(255, 255, 255, 0.05)',
diff --git a/packages/frontend/src/themes/d-botanical.json5 b/packages/frontend/src/themes/d-botanical.json5
index c03b95e2d7..b98908984b 100644
--- a/packages/frontend/src/themes/d-botanical.json5
+++ b/packages/frontend/src/themes/d-botanical.json5
@@ -13,8 +13,6 @@
 		fgHighlighted: '#fff',
 		divider: 'rgba(255, 255, 255, 0.14)',
 		panel: 'rgb(47, 47, 44)',
-		panelHeaderBg: '@panel',
-		panelHeaderDivider: '@divider',
 		header: ':alpha<0.7<@panel',
 		navBg: '#363636',
 		renote: '@accent',
diff --git a/packages/frontend/src/themes/d-dark.json5 b/packages/frontend/src/themes/d-dark.json5
index d24ce4df69..354b999d29 100644
--- a/packages/frontend/src/themes/d-dark.json5
+++ b/packages/frontend/src/themes/d-dark.json5
@@ -13,8 +13,6 @@
 		fgHighlighted: '#fff',
 		divider: 'rgba(255, 255, 255, 0.14)',
 		panel: '#2d2d2d',
-		panelHeaderBg: '@panel',
-		panelHeaderDivider: '@divider',
 		header: ':alpha<0.7<@panel',
 		navBg: '#363636',
 		renote: '@accent',
diff --git a/packages/frontend/src/themes/d-future.json5 b/packages/frontend/src/themes/d-future.json5
index b6fa1ab0c1..ac1d3166bc 100644
--- a/packages/frontend/src/themes/d-future.json5
+++ b/packages/frontend/src/themes/d-future.json5
@@ -14,8 +14,6 @@
 		fgOnAccent: '#000',
 		divider: 'rgba(255, 255, 255, 0.1)',
 		panel: '#18181c',
-		panelHeaderBg: '@panel',
-		panelHeaderDivider: '@divider',
 		renote: '@accent',
 		mention: '#f2c97d',
 		mentionMe: '@accent',
diff --git a/packages/frontend/src/themes/d-green-lime.json5 b/packages/frontend/src/themes/d-green-lime.json5
index a6983b9ac2..17629190d0 100644
--- a/packages/frontend/src/themes/d-green-lime.json5
+++ b/packages/frontend/src/themes/d-green-lime.json5
@@ -14,8 +14,6 @@
 		fgOnAccent: '#192320',
 		divider: '#e7fffb24',
 		panel: '#192320',
-		panelHeaderBg: '@panel',
-		panelHeaderDivider: '@divider',
 		popup: '#293330',
 		renote: '@accent',
 		mentionMe: '#ffaa00',
diff --git a/packages/frontend/src/themes/d-green-orange.json5 b/packages/frontend/src/themes/d-green-orange.json5
index 62adc39e29..bddcc242e7 100644
--- a/packages/frontend/src/themes/d-green-orange.json5
+++ b/packages/frontend/src/themes/d-green-orange.json5
@@ -14,8 +14,6 @@
 		fgOnAccent: '#192320',
 		divider: '#e7fffb24',
 		panel: '#192320',
-		panelHeaderBg: '@panel',
-		panelHeaderDivider: '@divider',
 		popup: '#293330',
 		renote: '@accent',
 		mentionMe: '#b4e900',
diff --git a/packages/frontend/src/themes/d-u0.json5 b/packages/frontend/src/themes/d-u0.json5
index b270f809ac..fb9b36663d 100644
--- a/packages/frontend/src/themes/d-u0.json5
+++ b/packages/frontend/src/themes/d-u0.json5
@@ -81,7 +81,6 @@
 		inputBorderHover: 'rgba(255, 255, 255, 0.2)',
 		wallpaperOverlay: 'rgba(0, 0, 0, 0.5)',
 		fgTransparentWeak: ':alpha<0.75<@fg',
-		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		scrollbarHandleHover: 'rgba(255, 255, 255, 0.4)',
 		deckDivider: '#142022',
 	},
diff --git a/packages/frontend/src/themes/l-botanical.json5 b/packages/frontend/src/themes/l-botanical.json5
index 2ea9a7d6c9..70089a55d2 100644
--- a/packages/frontend/src/themes/l-botanical.json5
+++ b/packages/frontend/src/themes/l-botanical.json5
@@ -13,8 +13,6 @@
 		fgHighlighted: '#6bc9a0',
 		divider: '#cfcfcf',
 		panel: '@X14',
-		panelHeaderBg: '@panel',
-		panelHeaderDivider: '@divider',
 		header: ':alpha<0.7<@panel',
 		navBg: '@X14',
 		renote: '#229e92',
diff --git a/packages/frontend/src/themes/l-light.json5 b/packages/frontend/src/themes/l-light.json5
index 248355c945..cd9f0c477d 100644
--- a/packages/frontend/src/themes/l-light.json5
+++ b/packages/frontend/src/themes/l-light.json5
@@ -14,7 +14,6 @@
 		header: ':alpha<0.7<@panel',
 		navBg: '#fff',
 		panel: '#fff',
-		panelHeaderDivider: '@divider',
 		mentionMe: 'rgb(0, 179, 70)',
 	},
 }
diff --git a/packages/frontend/src/themes/l-rainy.json5 b/packages/frontend/src/themes/l-rainy.json5
index 283dd74c6c..8bc63ee43d 100644
--- a/packages/frontend/src/themes/l-rainy.json5
+++ b/packages/frontend/src/themes/l-rainy.json5
@@ -12,7 +12,6 @@
 		fg: '#636b71',
 		panel: '#fff',
 		divider: 'rgb(230 233 234)',
-		panelHeaderDivider: '@divider',
 		renote: '@accent',
 		link: '@accent',
 		mention: '@accent',
diff --git a/packages/frontend/src/themes/l-u0.json5 b/packages/frontend/src/themes/l-u0.json5
index 03b114ba39..2cb79791b8 100644
--- a/packages/frontend/src/themes/l-u0.json5
+++ b/packages/frontend/src/themes/l-u0.json5
@@ -81,7 +81,6 @@
 		inputBorderHover: 'rgba(255, 255, 255, 0.2)',
 		wallpaperOverlay: 'rgba(0, 0, 0, 0.5)',
 		fgTransparentWeak: ':alpha<0.75<@fg',
-		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		scrollbarHandleHover: 'rgba(255, 255, 255, 0.4)',
 	},
 }
diff --git a/packages/frontend/src/themes/l-vivid.json5 b/packages/frontend/src/themes/l-vivid.json5
index b3c08f38ae..0ff087f471 100644
--- a/packages/frontend/src/themes/l-vivid.json5
+++ b/packages/frontend/src/themes/l-vivid.json5
@@ -60,7 +60,6 @@
 		scrollbarHandle: 'rgba(0, 0, 0, 0.2)',
 		wallpaperOverlay: 'rgba(255, 255, 255, 0.5)',
 		fgTransparentWeak: ':alpha<0.75<@fg',
-		panelHeaderDivider: '@divider',
 		scrollbarHandleHover: 'rgba(0, 0, 0, 0.4)',
 		X2: ':darken<2<@panel',
 		X3: 'rgba(0, 0, 0, 0.05)',
diff --git a/packages/frontend/src/ui/deck/column.vue b/packages/frontend/src/ui/deck/column.vue
index e895847bd9..7f6004ba62 100644
--- a/packages/frontend/src/ui/deck/column.vue
+++ b/packages/frontend/src/ui/deck/column.vue
@@ -316,12 +316,8 @@ function onDrop(ev) {
 	font-size: 0.9em;
 	color: var(--panelHeaderFg);
 	background: var(--panelHeaderBg);
-	box-shadow: 0 1px 0 0 var(--panelHeaderDivider);
 	cursor: pointer;
-
-	&, * {
-		user-select: none;
-	}
+	user-select: none;
 }
 
 .title {