diff --git a/frontend/components/organisms/annotation/GuidelineCard.vue b/frontend/components/organisms/annotation/GuidelineCard.vue
index 4f3bda5a..7a62e020 100644
--- a/frontend/components/organisms/annotation/GuidelineCard.vue
+++ b/frontend/components/organisms/annotation/GuidelineCard.vue
@@ -39,3 +39,42 @@ export default {
   }
 }
 </script>
+
+<style scoped>
+/* dark mode styles */
+.theme--dark >>> .tui-editor-contents h1 {
+  color: #fff; /* inversion of #000 */
+}
+.theme--dark >>> .tui-editor-contents h2,
+.theme--dark >>> .tui-editor-contents h3,
+.theme--dark >>> .tui-editor-contents h4,
+.theme--dark >>> .tui-editor-contents h5,
+.theme--dark >>> .tui-editor-contents h6,
+.theme--dark >>> .tui-editor-contents code span {
+  color: #ccc; /* inversion of #333 */
+}
+.theme--dark >>> .tui-editor-contents blockquote {
+  color: #888; /* inversion of #777777 */
+}
+.theme--dark >>> .tui-editor-contents ul,
+.theme--dark >>> .tui-editor-contents menu,
+.theme--dark >>> .tui-editor-contents ol,
+.theme--dark >>> .tui-editor-contents dir,
+.theme--dark >>> .tui-editor-contents p,
+.theme--dark >>> .tui-editor-contents table {
+  color: #aaa; /* inversion of #555555 */
+}
+.theme--dark >>> .tui-editor-contents table td {
+border: #151515; /* inversion of #eaeaea */
+}
+.theme--dark >>> .tui-editor-contents table th {
+  border: #8d8884; /* inversion of #72777b */
+  background-color: #847e7b; /* inversion of #7b8184 */
+}
+.theme--dark >>> .tui-editor-contents pre {
+  background-color: #0a0807; /* inversion of #f5f7f8 */
+}
+.theme--dark >>> .tui-editor-contents code {
+  color: #3e8774; /* inversion of #c1788b */
+}
+</style>