fixed cdb style

bin/cdb.css

@@ -285,6 +285,9 @@
   white-space: nowrap;
   overflow: hidden;
 }
+.cdb .cdb-sheet div.cdb-script {
+  position: relative;
+}
 .cdb .cdb-sheet div.cdb-script .codeeditor {
   min-width: 500px;
   min-height: 200px;

bin/cdb.less

@@ -321,6 +321,7 @@
 		}
 
 		div.cdb-script {
+			position : relative;
 			.codeeditor {
 				min-width: 500px;
 				min-height: 200px;