diff --git a/admin/css/style.css b/admin/css/style.css
index 9af949d7..a2ae70f8 100644
--- a/admin/css/style.css
+++ b/admin/css/style.css
@@ -1098,6 +1098,8 @@ a.operate-reply {
 #wmd-preview {
   background: #FFF;
   padding: 10px 20px; }
+  #wmd-preview img {
+    max-width: 100%; }
 
 /**
 * Jquery Timepicker
diff --git a/admin/scss/components/_editor.scss b/admin/scss/components/_editor.scss
index dc9dc2f3..de015c3d 100644
--- a/admin/scss/components/_editor.scss
+++ b/admin/scss/components/_editor.scss
@@ -64,4 +64,5 @@
 #wmd-preview {
   background: #FFF;
   padding: 10px 20px;
+  img { max-width: 100%; }
 }
\ No newline at end of file