@Anonymous - add this css to the very end of your base.css file and check, adjust number as per the need. This will change header size on all pages
.main-page-title{font-size: 30px;}
Thanks so much! Following on from that, do you know how I can reduce the gap between ‘Contact’ and the ‘Name’ box?
@Anonymous - add this css, this too will be applied on all pages
@media screen and (min-width: 750px){
.main-page-title {margin-bottom: 2rem !important;}
}