Banner text not wrapping on mobile

Site URL: http://www.shetland-financial.com

My company name is overlaid on a banner image.  It looks fine on desktop and tablet (though the size is currently smaller than I'd like as I was trying to fix this problem).  When viewed on mobile, the text is superimposed on itself (rather than wrapping on two lines).  How do I get it to automatically break itself into multiple lines?

Pic for reference (in case it happens to look ok on your phone)

Hi,

Change line-height to higher value

or add this to Home > Design > Custom CSS

@media screen and (max-width:640px) {
h1 {
    line-height: 40px;
}
}