Browser Issue: Header Displaced

Hello,

I have an issue regarding my website https://www.pitch-in.org.uk and the way the ‘header’ is displayed in certain browsers, namely Firefox.

When using Safari and Chrome everything is in the correct place, however when I open the website in Firefox the header is moved to the right and out-of-sync with the rest of the page.

If anyone could help resolve this issue it would be hugely appreciated!

My site was created using WordPress, Pytheas theme. This is the first site I have created, therefore a little unsure of coding and apprehensive in meddling with the site’s inner-workings.

Thanks for your time – I look forward to any answers you may have.