Fix a style problem with the backound on the index

client-data/index.css

@@ -1,6 +1,7 @@
-body {
+html {
 	background: linear-gradient(135deg, #c4dfffa0, transparent), url(/background.png);
 	width:100%;
+	height: 100%;
 	margin:0;
 	font-family: sans;
 	font-weight: 300;