Fix margin issues in pads

customize.dist/ckeditor-contents.css

@@ -15,7 +15,7 @@ body
     /* Remove the background color to make it transparent */
     background-color: #fff;
 
-    margin: 20px;
+    margin: 0;
     padding: 20px;
     position: absolute;
     top: 0;
@@ -24,6 +24,10 @@ body
     right: 0;
 }
 
+body > *:first-child {
+    margin-top: 0;
+}
+
 .cke_editable
 {
     font-size: 16px;