To change logo to black on portfolio page when mobile overlay menu is open on Squarespace, you can follow these.
#1. First, you need to find the portfolio page ID. In my example, it is:
- #collection-659bc1c532800e749cffecc3
#2. Use this code to Custom CSS box
body#collection-659bc1c532800e749cffecc3.header--menu-open header#header img {
filter: brightness(0) invert(0);
}
