add style for stand-alone back link with left arrow

Change-Id: Ia9219e3e77ef23c6bf6374244c57c4c7e8d1f386
diff --git a/tools/droiddoc/templates-sdk/assets/css/default.css b/tools/droiddoc/templates-sdk/assets/css/default.css
index eecab79..8bec584 100644
--- a/tools/droiddoc/templates-sdk/assets/css/default.css
+++ b/tools/droiddoc/templates-sdk/assets/css/default.css
@@ -461,6 +461,11 @@
   float:right;
 }
 
+a.back-link {
+    text-decoration: none;
+    text-transform: uppercase;
+}
+
 .paging-links {
   position: relative;
   height:30px; }
@@ -472,7 +477,8 @@
     text-decoration: none;
     text-transform: uppercase; }
     .paging-links .prev-page-link:before,
-    .training-nav-top .prev-page-link:before {
+    .training-nav-top .prev-page-link:before,
+    a.back-link:before {
       content: '';
       background: transparent url(../images/styles/disclosure_left.png) no-repeat scroll 50% 50%;
       width: 10px;