diff --git a/example/partials/viewer.html b/example/partials/viewer.html
index 5abeb8e..b98e1c5 100644
--- a/example/partials/viewer.html
+++ b/example/partials/viewer.html
@@ -1,12 +1,12 @@
 <nav ng-class="getNavStyle(scroll)">
-  <button ng-click="goPrevious()"><</span></button>
-  <button ng-click="goNext()">></span></button>
+  <button ng-click="goPrevious()"><span>&lt;</span></button>
+  <button ng-click="goNext()"><span>&gt;</span></button>
 
-  <button ng-click="zoomIn()">+</span></button>
-  <button ng-click="fit()">100%</span></button>
-  <button ng-click="zoomOut()">-</span></button>
+  <button ng-click="zoomIn()"><span>+</span></button>
+  <button ng-click="fit()"><span>100%</span></button>
+  <button ng-click="zoomOut()"><span>-</span></button>
 
-  <button ng-click="rotate()">90</span></button>
+  <button ng-click="rotate()"><span>90</span></button>
 
   <span>Page: </span>
   <input type="text" min=1 ng-model="pageNum">