Designate a specific homepage for mobile that isnt my normal homepage

hi, I'd like to learn How to designate a specific page that will be my homepage for mobile...but that isnt my normal homepage.  We are on 7.0 with Brine template family.   Our prior web editor was taking care of this, however they are no longer with the company. 

Hi,

You mean you want to use a different layout for mobile?

You can create another page & design layout for mobile. Then add this code to Page Header of first page (desktop page), this code will redirect users to new page on mobile

<script type="text/javascript">
if (screen.width <= 767) {
document.location = "https://google.com";
}
</script>

Replace google with mobile page url