Header over close button

Terms & Conditions is a pop-up article which user should check to submit form on this page - https://www.starmusicawards.com/gold-member-form

The problem is, the close button is not clickable as it seems the Header covers the pop-up close button. See screenshot link - https://prnt.sc/AJ6j-lmhPJFU

How can I resolve this?

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