diff --git a/packages/frontend/src/ui/deck.vue b/packages/frontend/src/ui/deck.vue
index 461396daf..8479aaa77 100644
--- a/packages/frontend/src/ui/deck.vue
+++ b/packages/frontend/src/ui/deck.vue
@@ -9,7 +9,7 @@
 				<!-- sectionを利用しているのは、deck.vue側でcolumnに対してfirst-of-typeを効かせるため -->
 				<section
 					v-if="ids.length > 1"
-					:class="[$style.column, $style.folder]"
+					:class="$style.folder"
 					:style="columns.filter(c => ids.includes(c.id)).some(c => c.flexible) ? { flex: 1, minWidth: '350px' } : { width: Math.max(...columns.filter(c => ids.includes(c.id)).map(c => c.width)) + 'px' }"
 				>
 					<DeckColumnCore v-for="id in ids" :ref="id" :key="id" :column="columns.find(c => c.id === id)" :is-stacked="true" @parent-focus="moveFocus(id, $event)"/>
@@ -49,7 +49,7 @@
 		<button :class="$style.navButton" class="_button" @click="drawerMenuShowing = true"><i :class="$style.navButtonIcon" class="ti ti-menu-2"></i><span v-if="menuIndicated" :class="$style.navButtonIndicator"><i class="_indicatorCircle"></i></span></button>
 		<button :class="$style.navButton" class="_button" @click="mainRouter.push('/')"><i :class="$style.navButtonIcon" class="ti ti-home"></i></button>
 		<button :class="$style.navButton" class="_button" @click="mainRouter.push('/my/notifications')"><i :class="$style.navButtonIcon" class="ti ti-bell"></i><span v-if="$i?.hasUnreadNotification" :class="$style.navButtonIndicator"><i class="_indicatorCircle"></i></span></button>
-		<button :class="[$style.navButton, $style.postButton]" class="_button" @click="os.post()"><i :class="$style.navButtonIcon" class="ti ti-pencil"></i></button>
+		<button :class="$style.postButton" class="_button" @click="os.post()"><i :class="$style.navButtonIcon" class="ti ti-pencil"></i></button>
 	</div>
 
 	<Transition :name="$store.state.animation ? 'menu-back' : ''">
@@ -298,6 +298,7 @@ async function deleteProfile() {
 }
 
 .folder {
+	composes: column;
 	display: flex;
 	flex-direction: column;
 
@@ -402,6 +403,7 @@ async function deleteProfile() {
 }
 
 .postButton {
+	composes: navButton;
 	background: linear-gradient(90deg, var(--buttonGradateA), var(--buttonGradateB));
 	color: var(--fgOnAccent);
 }
diff --git a/packages/frontend/src/ui/universal.vue b/packages/frontend/src/ui/universal.vue
index 00e65ebee..503a25cba 100644
--- a/packages/frontend/src/ui/universal.vue
+++ b/packages/frontend/src/ui/universal.vue
@@ -23,7 +23,7 @@
 		<button :class="$style.navButton" class="_button" @click="mainRouter.currentRoute.value.name === 'index' ? top() : mainRouter.push('/')"><i :class="$style.navButtonIcon" class="ti ti-home"></i></button>
 		<button :class="$style.navButton" class="_button" @click="mainRouter.push('/my/notifications')"><i :class="$style.navButtonIcon" class="ti ti-bell"></i><span v-if="$i?.hasUnreadNotification" :class="$style.navButtonIndicator"><i class="_indicatorCircle"></i></span></button>
 		<button :class="$style.navButton" class="_button" @click="widgetsShowing = true"><i :class="$style.navButtonIcon" class="ti ti-apps"></i></button>
-		<button :class="[$style.navButton, $style.postButton]" class="_button" @click="os.post()"><i :class="$style.navButtonIcon" class="ti ti-pencil"></i></button>
+		<button :class="$style.postButton" class="_button" @click="os.post()"><i :class="$style.navButtonIcon" class="ti ti-pencil"></i></button>
 	</div>
 
 	<Transition
@@ -350,6 +350,7 @@ $widgets-hide-threshold: 1090px;
 }
 
 .postButton {
+	composes: navButton;
 	background: linear-gradient(90deg, var(--buttonGradateA), var(--buttonGradateB));
 	color: var(--fgOnAccent);
 }