Malpositioned close button in fork popup #3283

This is a bug of GitHub itself. I don't know if they forget to update the fork popup's style, but now we have this annoying close button:

If you compare it to other popups you will notice the difference:

Checkout fork popup's title style:

position: relative seems to be the culprit. Let's try position: static then:

Fine, but the position is still wrong. Now add some style to make it looks consistent with other popups:

font-size: 14px;
font-weight: 600;
min-height: unset;

It definitely looks better! Maybe we should include these styles in Refined GitHub. I will email GitHub about the wrong style too.