I Would add to #mega-wrapper .mega-menu display:inline-block to make the menu a block and change the height from 30px to auto to fill that block.
HTML Code:
#mega-wrapper .mega-menu{display:inline-block;height:auto;}
I noticed that you still have multiple jquerys running... That date picker code has one and I noticed you have added a jquery1.7 to that list. Your site starts with jquery 3.4, the other jquerys are going to fight that.
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