use opacity instead of font-weight to prevent jumping of text

radia.css

@@ -20,3 +20,11 @@
   -webkit-border-radius: 8px;
 }
 
+text {
+  background-color: #ffff00;
+  opacity: 0.6;
+}
+
+tspan {
+  font-weight: bold;
+}

radia.js

@@ -25,13 +25,15 @@ $(function() {
   $(window).resize();
   $.getJSON("radia.json", {}, function(data) {
     var highlightCSS = {
-      'fontWeight': 'bold',
-      'backgroundColor': '#ffff00'
+      'opacity': "1.0"
+//      'fontWeight': 'bold',
+//      'backgroundColor': '#ffff00'
     }
 
     var unhighlightCSS = {
-      'fontWeight': 'normal',
-      'backgroundColor': '#ffffff'
+      'opacity': "0.6"
+//      'fontWeight': 'normal',
+//      'backgroundColor': '#ffffff'
     }
 
     var R = data;