样式修改

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

@@ -7,9 +7,12 @@ body, html {
     min-height: 100%;
 }
 body {
-    position: fixed;
-    width: 100%;
+    background-repeat: no-repeat;
+    background-position: center;
+    background-attachment: fixed;
+    z-index: -1;
     height: 100%;
+    width: 100%;
     background-size: cover;
     background-image: url(../img/invitation_background.png);
 	font-family: Microsoft YaHei, 微软雅黑, simhei;
@@ -17,7 +20,7 @@ body {
 	color:#333;	
 }
 .x-join-bottom {
-    margin-top: -85px;
+    bottom: 0;
     width: 100%;
     position: absolute;
     height: 55px;