Add Esc and Arrow icons in the slide's present mode

www/slide/inner.html

@@ -92,6 +92,9 @@
 
     <span class="cp slide">
     <div id="modal">
+        <div id="button_exit" class="button"><span class="fa fa-times"></span></div>
+        <div id="button_left" class="button"><span class="fa fa-chevron-left"></span></div>
+        <div id="button_right" class="button"><span class="fa fa-chevron-right"></span></div>
         <div id="content"></div>
     </div>
     </span>