Implemented button highlighting.

resources/report/css/style.css

@@ -478,4 +478,8 @@ label[for=editorPriorityValue] {
 }
 [draggable] {
     -webkit-user-select: none;
+}
+.highlight {
+    background: #69aaff;
+    color: #f8f8f8;
 }

resources/report/js/script.js

@@ -65,6 +65,9 @@ function hideElement(element) {
         element.classList.toggle('hidden', true);
     }
 }
+function highlightElement(element, state) {
+    element.classList.toggle('highlight', state);
+}
 function toggleDisplayCSS(evt) {
     var e = document.getElementsByClassName(evt.target.getAttribute('data-class'));
     if (evt.target.checked) {