(Squarespace) How to change color of navigation on Portfolio overview page only

To change color of Navigation on Portfolio Overview Page only, you can follow these.

#1. First, find Portfolio Overview Page ID.

In my example, it is: #collection-673e9a14857d4032d3e2f27b

#2. Next, use this code to Custom CSS box.

#collection-673e9a14857d4032d3e2f27b {
    div.header-nav-item>a {
        color: #f1f !important;
    }
    div.burger-inner>div {
        background-color: #f1f !important;
    }
}