Header image changes size in different browsers

For some reason unknown to me my header image is changing size in different browsers. It looks fine in Chrome however when viewed in Firefox it too big. Could anyone shed any light on this problem for me please?

Thanks for any help!

P.S Here’s a link to the page mentioned: http://clarkandpartners.co.uk/blog/

Hi @jamesbw,

I hope you are well today and thank you for your question.

I have tested it on both firefox and chrome browsers but it is displaying same for me.

Please make sure you are using latest versions of browsers and then share me the screenshots of what you see on it.

Best Regards,