wordpress simple site

Hi anyone out there know of a theme that has a header of say 1000 but the body is less than that – say 800.
Alternativly anyone know how to amend a theme to do this.
i am trying to create a wordpress site that looks similar to https://www.vincetownsdemo.com/LangleyParkDental/LangleyParkDental.html

any help is greatly appreciated

Regards
webpaje