diff --git a/admin/css/style.css b/admin/css/style.css
index 0d0fa276..3bdaeed0 100644
--- a/admin/css/style.css
+++ b/admin/css/style.css
@@ -1112,6 +1112,9 @@ a.operate-reply {
   #wmd-preview img {
     max-width: 100%; }
   #wmd-preview code, #wmd-preview pre {
+    padding: 2px 4px;
+    max-height: 400px;
+    overflow: auto;
     background: #F6F6F3;
     font-size: .92857em; }
   #wmd-preview pre {
diff --git a/admin/scss/components/_editor.scss b/admin/scss/components/_editor.scss
index 999a0572..f70a9b12 100644
--- a/admin/scss/components/_editor.scss
+++ b/admin/scss/components/_editor.scss
@@ -67,6 +67,9 @@
   padding: 10px 20px;
   img { max-width: 100%; }
   code, pre {
+    padding: 2px 4px;
+    max-height: 400px;
+    overflow: auto;
     background: #F6F6F3;
     font-size: .92857em;
   }