Mobile Navigation Crushing Text

Site URL: https://www.newworldangels.com/

Everything is working with the design on desktop. However, the navigation bar on mobile is acting odd (see attached). I am very unfamiliar with the mobile CSS objects and styling in general. My novice experience sees two routes: 

1. Expand the text box so the overflow creates a second row.
2. Have the text content change when on mobile (I saw a related answer for this, but it wasn't working when I tried it).

If one of these is a solid way to go, how would I implement it in CSS. If not what's the better way?

Add to Home > Design > Custom CSS

@media screen and (max-width:640px) {
.Mobile-overlay-nav-item[href*="/gust.com"] {
    line-height: 1em !important;
}
}