ENGCOM-3196: solved calender icon issue in advance pricing in adminpanel #18638

 - Merge Pull Request #18638 from speedy008/magento2:fix-issue-18581-2.3
 - Merged commits:
   1. 039c88d

Author: magento-engcom-team

app/design/adminhtml/Magento/backend/web/css/source/components/_calendar-temp.less

@@ -43,7 +43,7 @@
         height: @action__height;
         margin-left: -@action__height;
         overflow: hidden;
-        position: relative;
+        position: absolute;
         vertical-align: top;
         z-index: 1;