New TOC for dart-by-example page

src/site/css/dart-style.css

 
 body {
   font-family: 'Roboto', sans-serif;
     -webkit-font-smoothing: antialiased;
 }
 
 /* ***** General ***** */
 p,
 dt,
 dd {
@@ skipping 118 matching lines @@
   }
 
 
 }
 
 i.sprite-icon-social-gplus {
   background-position: -50px -50px;
 }
 
 i.sprite-icon-browsers {
-  width: 193px;
-  height: 36px;
-  background-position: 0 -100px;
+  width: 223px;
+  height: 50px;
+  background-position: 0 -90px;
   margin: 0 auto;
 }
 
 i.sprite-icon-dart-logo {
   width: 117px;
   height: 33px;
   background-position: 0 0;
 }
 
 i.sprite-icon-timer {
@@ skipping 1315 matching lines @@
   .synonym nav ul {
     -moz-column-count:1; /* Firefox */
     -webkit-column-count:1; /* Safari and Chrome */
     column-count:1;
   }
 }
 
 .titlepage h3 {
   font: 400 26px/32px 'Montserrat', sans-serif;
 }