fix: bug fix

Author: dataeaseShu

frontend/src/style.less

@@ -222,3 +222,11 @@ strong {
     border-radius: 4px;
   }
 }
+
+.markdown-body {
+  hr {
+    border: none !important;
+    background: #1f232926 !important;
+    height: 1px !important;
+  }
+}