fix: replaced show and hide class hidden with attribute hidden

Author: frankpagan

docs/index.html

@@ -66,7 +66,7 @@ <h2 class="border-bottom:1px_solid_lightgrey padding:5px_0px">Demo</h2>
         			    <div class="container svColumn overflow:hidden card border-radius:2px width:auto height:100%" id="sandbox">
         			       <div class="font-size:20px position:absolute top:10px right:10px opacity:0.6 z-index:7">
         			        <a class="margin-right:10px" id="preview" show="preview" hide="code"><i class="far fa-eye"></i></a>
-        			        <a class="margin-right:10px hidden" id="code" show="code" hide="preview"><i class="fas fa-code"></i></a>
+        			        <a class="margin-right:10px" id="code" show="code" hide="preview" hidden><i class="fas fa-code"></i></a>
         			        <!--<a class="margin-right:10px"><i class="far fa-window-maximize"></i></a>-->
         					<a target="modal" href="module_activity_datatable.html"
         				  	     pass-collection="modules"