White line about banner

I hope that I am ok to ask this on here when I am using a “paid” theme – if not sorry – let me know and I will delete.

I am trying to update a website for my football club and have got the Football Theme from SportsPress for this.

When I used the theme to set up the banner it fitted fine on the page but I didnt like the default font (and i couldn’t change it!!) so did my own banner, using the sizes given but when its uploaded it puts a white line between the banner and the top of the page. I have tried some CSS code suggested on here but nothing has sorted it.

Please ignore the rest of the site, its a work in progress so I am still working through what it is going to look like.

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