Tweaks for promo messages on NTP

chrome/browser/resources/new_new_tab.css

Index: chrome/browser/resources/new_new_tab.css
===================================================================
--- chrome/browser/resources/new_new_tab.css	(revision 32147)
+++ chrome/browser/resources/new_new_tab.css	(working copy)
@@ -690,23 +690,27 @@
 /* promotions line */
 #bottom-right-promo {
   position: absolute;
-  display: block;
   width: 180px;
   height: 131px;
   border: 0;
   bottom: 0px;
   right: 0px;
+  z-index: -1;
 }
 
 #footer {
   position: fixed;
-  bottom: 0px;
+  bottom: 0;
   left: 0px;
   text-align: center;
   width: 100%;
-  display: block;
+  -webkit-transition: bottom .15s;
 }
 
+#footer.hide-footer {
+  bottom: -40px;
+}
+
 #promo-line {
   background-color: hsl(52, 100%, 80%);
   border: 1px solid rgb(211, 211, 211);