How can I reduce the text size, while on mobile, of the navigation on a portfolio page set as hover background in 7.1

Site URL: https://seal-mushroom-jf6r.squarespace.com/

The issue I am having is that one of the titles is to too long to fit on a single line when on a mobile browser. 

I have done a bit of digging and it appears that the main navigation formatting is determined by the H1 settings. So I can force H1 to be smaller as a universal setting but that has some negative consequences in other places. Is there any way to reduce the size of this text only on mobile browser? Any advice would be appreciated. Screen snaps below that show both the desktop and mobile appearance.

3 hours ago, michael.dabbs said:

Site URL: https://seal-mushroom-jf6r.squarespace.com/

The issue I am having is that one of the titles is to too long to fit on a single line when on a mobile browser. 

I have done a bit of digging and it appears that the main navigation formatting is determined by the H1 settings. So I can force H1 to be smaller as a universal setting but that has some negative consequences in other places. Is there any way to reduce the size of this text only on mobile browser? Any advice would be appreciated. Screen snaps below that show both the desktop and mobile appearance.

What is your site password

password is 

happy

46 minutes ago, michael.dabbs said:

password is 

happy

try

@media only screen and (max-width: 600px) {
      #collection-603525dfadad1b7bece2e3e0 h1.portfolio-hover-item-title  {
        font-size: 2.5em !important;

      }
      #collection-603525dfadad1b7bece2e3e0 h1.portfolio-hover-item-title span {
         margin: 0 !important; 
      }
}

Thanks! I had to adjust the em ratio but everything else worked perfectly.