code review by liangzhifeng

@@ -10,6 +10,12 @@
     bottom: 70px;
     z-index: 10;
 
+    a {
+        display: block;
+        width: 100%;
+        height: 100%;
+    }
+
     .iconfont {
         color: #fff;
         font-size: 18px;
@@ -26,4 +32,4 @@
         right: 0;
         color: #fff;
     }
-}
\ No newline at end of file
+}