Doesn’t work well on mobile

No matter what I do I can’t get rid of the black bar across the top when accessing on a mobile phone. It covers the menu as well as the site name. I believe it’s the wordpress bar? or.. not sure but I’ve been playing with it all night and can not seem to resolve it.
Also, at the bottom of the pages it says ‘pages’ for some reason. Ive had this site for about 3 years and not had this issue before.