Revert "add custom background for this transversal month"

This reverts commit 28427520.

panikweb_templates/static/css/_specifics.scss

@@ -202,8 +202,7 @@ button.check:before, a.check:before {
 /**** BODY ****/
 /****************************************************/
 body{
-	background: white url(../img/volbg.jpeg) bottom center no-repeat;
-	background-size: contain;
+	background: white;
 	color: #333;
 }
 /****************************************************/