Added bg color for demo pages

Author: toddparker

docs/_assets/css/jqm-docs.css

@@ -1,3 +1,5 @@
+body { background: #dddddd;}
+
 .ui-mobile #jqm-home {  background: #e5e5e5 url(../images/jqm-sitebg.png) top center repeat-x; }
 .ui-mobile #jqm-homeheader { padding: 55px 25px 0; text-align: center }
 .ui-mobile #jqm-homeheader h1 { margin: 0 0 10px; }
@@ -12,4 +14,5 @@ dt { font-weight: bold; margin: 2em 0 .5em; }
 dt code, dd code { font-size:1.3em; line-height:150%; }
 pre { white-space: pre; white-space: pre-wrap; word-wrap: break-word; }
 
-.ui-header .jqm-home { top:0.6em; }
+.ui-header .jqm-home { top:0.65em; }
+