Fixed Navigation on Mobile but NOT Desktop on 7.1

On 9/30/2021 at 2:37 AM, renee.hartwick said:

Site URL: https://ave.squarespace.com/

Site: ave.squarespace.com
PW: theeyeshaveit

The clients I'm building this site for would love to have sticky/fixed nav on mobile but NOT on desktop, and I'm finding the CSS for that tricky. I gave the code from this post a try, but no luck. 

Has anyone else had success with this?

Add to Design > Custom Css

@media only screen and (max-width: 768px) {
  #header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
  }
}