diff --git a/src/components/editor/MarkdownEditor.vue b/src/components/editor/MarkdownEditor.vue
index 902d02e..ce9afd8 100644
--- a/src/components/editor/MarkdownEditor.vue
+++ b/src/components/editor/MarkdownEditor.vue
@@ -110,3 +110,21 @@ onBeforeUnmount(() => {
     <input ref="imgInput" type="file" accept="image/*" hidden @change="onImagePick" />
   </div>
 </template>
+
+<!-- 전역(unscoped): Toast UI 팝업이 좁은 화면(댓글창 등)에서 좌측으로 넘쳐 잘리는 문제 →
+     모바일에선 화면 중앙 모달로 띄워 항상 보이게 한다. -->
+<style>
+@media (max-width: 768px) {
+  .toastui-editor-popup {
+    position: fixed !important;
+    left: 50% !important;
+    top: 50% !important;
+    right: auto !important;
+    transform: translate(-50%, -50%) !important;
+    max-width: 94vw !important;
+    max-height: 80vh;
+    overflow: auto;
+    z-index: 1300;
+  }
+}
+</style>