diff --git a/packages/frontend/src/components/MkEmojiPicker.vue b/packages/frontend/src/components/MkEmojiPicker.vue
index af9fa12525e1..73cfac800b14 100644
--- a/packages/frontend/src/components/MkEmojiPicker.vue
+++ b/packages/frontend/src/components/MkEmojiPicker.vue
@@ -594,6 +594,7 @@ defineExpose({
 						width: auto;
 						height: auto;
 						min-width: 0;
+						padding: 0;
 
 						&:disabled {
 							cursor: not-allowed;
@@ -700,7 +701,7 @@ defineExpose({
 
 				> .item {
 					position: relative;
-					padding: 0;
+					padding: 0 3px;
 					width: var(--eachSize);
 					height: var(--eachSize);
 					contain: strict;
diff --git a/packages/frontend/src/components/MkNotification.vue b/packages/frontend/src/components/MkNotification.vue
index 8d575dd74b61..1450a3022db1 100644
--- a/packages/frontend/src/components/MkNotification.vue
+++ b/packages/frontend/src/components/MkNotification.vue
@@ -46,7 +46,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				:withTooltip="true"
 				:reaction="notification.reaction.replace(/^:(\w+):$/, ':$1@.:')"
 				:noStyle="true"
-				style="width: 100%; height: 100%;"
+				style="width: 100%; height: 100% !important; object-fit: contain;"
 			/>
 		</div>
 	</div>
@@ -123,7 +123,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							:withTooltip="true"
 							:reaction="reaction.reaction.replace(/^:(\w+):$/, ':$1@.:')"
 							:noStyle="true"
-							style="width: 100%; height: 100%;"
+							style="width: 100%; height: 100% !important; object-fit: contain;"
 						/>
 					</div>
 				</div>
diff --git a/packages/frontend/src/components/MkReactionTooltip.vue b/packages/frontend/src/components/MkReactionTooltip.vue
index 15409a216a30..77ca841ad0c0 100644
--- a/packages/frontend/src/components/MkReactionTooltip.vue
+++ b/packages/frontend/src/components/MkReactionTooltip.vue
@@ -36,6 +36,7 @@ const emit = defineEmits<{
 .icon {
 	display: block;
 	width: 60px;
+	max-height: 60px;
 	font-size: 60px; // unicodeな絵文字についてはwidthが効かないため
 	margin: 0 auto;
 	object-fit: contain;
diff --git a/packages/frontend/src/components/MkReactionsViewer.details.vue b/packages/frontend/src/components/MkReactionsViewer.details.vue
index 60118fadd2a4..7a2f3b77398c 100644
--- a/packages/frontend/src/components/MkReactionsViewer.details.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.details.vue
@@ -63,6 +63,7 @@ function getReactionName(reaction: string): string {
 .reactionIcon {
 	display: block;
 	width: 60px;
+	max-height: 60px;
 	font-size: 60px; // unicodeな絵文字についてはwidthが効かないため
 	object-fit: contain;
 	margin: 0 auto;
diff --git a/packages/frontend/src/pages/custom-emojis-manager.vue b/packages/frontend/src/pages/custom-emojis-manager.vue
index 6d86a60d9e78..27c9dac2dc2b 100644
--- a/packages/frontend/src/pages/custom-emojis-manager.vue
+++ b/packages/frontend/src/pages/custom-emojis-manager.vue
@@ -349,6 +349,7 @@ definePageMetadata(() => ({
 				> .img {
 					width: 42px;
 					height: 42px;
+					object-fit: contain;
 				}
 
 				> .body {
@@ -395,6 +396,7 @@ definePageMetadata(() => ({
 				> .img {
 					width: 32px;
 					height: 32px;
+					object-fit: contain;
 				}
 
 				> .body {