diff --git a/CHANGELOG.md b/CHANGELOG.md
index c01d284bd..7af74f86f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@
 - Enhance: コントロールパネル内のファイル一覧でセンシティブなファイルを区別しやすく
 - Fix: サーバーメトリクスが2つ以上あるとリロード直後の表示がおかしくなる問題を修正
 - Fix: 月の違う同じ日はセパレータが表示されないのを修正
+- Fix: 縦横比が極端なカスタム絵文字を表示する際にレイアウトが崩れる箇所があるのを修正  
+  (Cherry-picked from https://github.com/MisskeyIO/misskey/pull/725)
 
 ### Server
 - Fix: アンテナの書き込み時にキーワードが与えられなかった場合のエラーをApiErrorとして投げるように
diff --git a/packages/frontend/src/components/MkEmojiPicker.vue b/packages/frontend/src/components/MkEmojiPicker.vue
index 5ba175fc3..3bad8da06 100644
--- a/packages/frontend/src/components/MkEmojiPicker.vue
+++ b/packages/frontend/src/components/MkEmojiPicker.vue
@@ -611,6 +611,7 @@ defineExpose({
 						width: auto;
 						height: auto;
 						min-width: 0;
+						padding: 0;
 
 						&:disabled {
 							cursor: not-allowed;
@@ -717,7 +718,7 @@ 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 ee6574357..738cba213 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+):$/, ':$1@.:')"
 				:noStyle="true"
-				style="width: 100%; height: 100%;"
+				style="width: 100%; height: 100% !important; object-fit: contain;"
 			/>
 		</div>
 	</div>
@@ -122,7 +122,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							:withTooltip="true"
 							:reaction="reaction.reaction.replace(/^:(\w+):$/, ':$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 15409a216..77ca841ad 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 3dd02b261..8038ec742 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 eea3f6813..4747aa520 100644
--- a/packages/frontend/src/pages/custom-emojis-manager.vue
+++ b/packages/frontend/src/pages/custom-emojis-manager.vue
@@ -344,6 +344,7 @@ definePageMetadata(() => ({
 				> .img {
 					width: 42px;
 					height: 42px;
+					object-fit: contain;
 				}
 
 				> .body {
@@ -390,6 +391,7 @@ definePageMetadata(() => ({
 				> .img {
 					width: 32px;
 					height: 32px;
+					object-fit: contain;
 				}
 
 				> .body {