FIxed conflicting css classes

editor/editor.html

-<div>
+<div id="ks-editor">
     <style>
-        section {
+        div#ks-editor section {
             border: 1px lightgrey solid;
             border-radius: 1px;
             margin: 5px;
@@ -8,11 +8,11 @@
             width: auto;
         }
 
-        section > * {
+        div#ks-editor section > * {
             margin: 2.5px;
         }
 
-        .selected {
+        div#ks-editor *.selected {
             background-color: lightblue;
         }
     </style>