修改

@@ -2,7 +2,7 @@ body{
 	background-color: #FFFFFF;
 	background-color: #FFFFFF;
 }
 }
 .position_a{
 .position_a{
-	position: absolute;
+	position: fixed;
 }
 }
 .pic_wrap{
 .pic_wrap{
 	width: 2.3rem;
 	width: 2.3rem;