Close pop up x missing

I have tested several operating systems and multiple browsers. Firefox, Chrome and Safari do not show the “X” in the upper left hand corner of the bio boxes. The only way to close is to press the “ESC” key or click off to the side of the website page. The x does show in Edge and IE but it is very faint.

I do not see a way to adjust in the settings.

The page I need help with: [log in to see the link]