Fix login button not working when the window size is too small

pixelegg/mobile/fw_mobile.css

@@ -7337,6 +7337,7 @@ form[id^="ranking-"] .dialogHeadbar {
     margin: 0 auto;
   }
   div#loginMainDiv div#centerBox {
+    position: relative;
     padding: 0;
     -webkit-border-top-right-radius: 0;
     -webkit-border-bottom-right-radius: 0;
@@ -7396,6 +7397,9 @@ form[id^="ranking-"] .dialogHeadbar {
   }
 }
 @media only screen and (max-device-width : 1024px) and (orientation : portrait) {
+  body div#loginMainDiv div#centerBox {
+    position: relative;
+  }
   body div#loginMainDiv div#centerBox form table.divLoginbox {
     width: 100%;
   }

pixelegg/mobile/fw_mobile.less

@@ -112,6 +112,7 @@
 				}
 			}
 			div#centerBox{
+				position: relative;
 				padding: 0;
 				-webkit-border-top-right-radius: 0;
 				-webkit-border-bottom-right-radius:0;
@@ -173,6 +174,7 @@
 	body{
 		div#loginMainDiv{
 			div#centerBox{
+				position: relative;
 				form {
 					table.divLoginbox {
 						width:100%;