How to disable button hover effect on Dawn theme mobile version?

Using Dawn theme, on the mobile version of my site one of the buttons needs to be clicked twice to get to work. I believe this issue is caused by a hover effect. Can anyone please aid with disabling this functionality please? The button in question is the toggle button (specifically: close) for the product media modal window. I have attached an image of the button below.

URL: https://eggculture.com/

password: mTf9P0pS6HuW4fM