A first shot at improving the .jumbotron styles.

docs/_includes/head.html

@@ -54,7 +54,33 @@
     }
   }
 
-  .navbar-inverse .navbar-brand { color: #fff; }
+  section {
+    margin-bottom: 40px;
+  }
+
+  .btn-toolbar {
+    margin-bottom: 20px;
+  }
+
+  .jumbotron {
+    background-color: #428BCA;
+    color: #fff;
+  }
+
+  .btn-outline-inverse {
+    color: #FFF;
+    background-color: transparent;
+    border-color: #fff;
+  }
+
+  .btn-outline-inverse:hover {
+    color: #428BCA;
+    background-color: white;
+  }
+
+  .navbar {
+    border-bottom: 1px solid #eee;
+  }
 
   /* anchor.js */
   .anchorjs-link {

docs/index.html

@@ -15,7 +15,7 @@ slug: home
       </div>
       <div class="col-md-6 jumbotron-side text-center">
         <p>
-          <a href="https://github.com/select2/select2/releases" class="btn btn-success btn-lg">
+          <a href="https://github.com/select2/select2/releases" class="btn btn-outline-inverse btn-lg">
             <i class="fa fa-download fa-lg"></i>
             Download
           </a>