浮动块调整

frontend/saas-portal-web/static/css/invitation_mobile_join.css

@@ -11,11 +11,14 @@ select{
     background-origin: content-box;
     background: url(../img/assets/expand.png) no-repeat scroll right center transparent;
 }
+html,body{
+    height: 100%;
+    width: 100%;
+}
 body {
     background-repeat: no-repeat;
     background-position: center;
-    background-position-y: -100px;
-    background-attachment: fixed;
+    height: 100%;
     z-index: -1;
     width: 100%;
     background-size: cover;