Remove header image from all pages other than home

Hi all,

I am using the Twenty Sixteen them and wish to only have the header image on the home page. I have tried most of the solutions in the forum but none seem to work.

Would someone be able to help? I would rather do it with css rather than editing the header.php file. I am using a child theme, but there is no header.php file in my child theme directory.

My site is castleimages.net.au

Regards,

Steve