Change email shadow box color

VAN-178

openedx/core/djangoapps/ace_common/templates/ace_common/edx_ace/common/base_body.html

@@ -45,7 +45,7 @@
     <![endif]-->
 
     <!-- CONTENT -->
-    <table class="content" role="presentation" align="center" cellpadding="0" cellspacing="0" border="0" bgcolor="#f5f5f5" width="100%" style="
+    <table class="content" role="presentation" align="center" cellpadding="0" cellspacing="0" border="0" bgcolor="#fbfaf9" width="100%" style="
         font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
         font-size: 1em;
         line-height: 1.5;