CSS difference between . and : plus How can I make a div fixed while another div is fixed


This Content is from Stack Overflow. Question asked by Larsco Rubin

So basically I have two questions.
First question: I have found this codepen : https://codepen.io/WebDevSimplified/pen/LqKQRK
It makes no sense to me why .active and not :active? When I change it with : is not working at all.

.navbar-links.active {
      display: flex;
      color: transparent;
  }  ```

Second question: Is it possible to make a div fixed while another div is active?


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