Page content width

Hi,

I started using you theme today and i must say that i’m very happy.
But (there’s allways a but ?? )
I need to change the page width from 1349px to full (1920px) and i would like to remove the <header class=”entry-header”>
my website: https://greenway.lin44.host25.com/

Thank you in advance for your help.
Ragards,
Dario

[ No bumping please. ]