editor "active" class feature

src/editor.html

@@ -113,6 +113,9 @@ layout: default
 			.on('click', '.js-icon', function (e) {
 				var icon = $(this).attr('data-icon');
 
+				$('.js-icon').removeClass('active');
+				$(this).addClass('active');
+
 				$('.js-icon-name').html(icon);
 				localStorage.setItem('icon', icon);
 

src/style.scss

@@ -179,6 +179,10 @@ a {
   justify-content: center;
   border: 1px solid transparent;
 
+  &.active {
+    background: #f0f0f0;
+  }
+
   @at-root a#{&}:hover {
     opacity: .75;
   }