WordPress: Eighties Theme: Responsive Site Identity Text

Hello, I'm using the Eighties Theme on Wordpress 4.9.6 (latest version) ... My header is responsive to mobile until I add Site Identity Text and then the header shrinks to fit the text. I'm wondering if there is a code solution (or something else) to fix this issue... A way to make the text responsive so it will show inside of the full header on mobile the same way it appears from a computer screen. The site is respectyourgift.com Thanks.