To apply styles to specific popups, you can target the popup by it’s (url) or (url) and (selector), but without the parenthesis.
For example, if wanted to target my popups on my /form page to make them smaller. I’d use this:
[data-active-popup="/form"] {
--wm-popup-width: 500px;
--wm-popup-max-height: 50vh;
}
If I wanted to target a popup using a specific block, I’d use this:
[data-active-popup="/form#block-id-1234"] {
--wm-popup-width: 500px;
--wm-popup-max-height: 50vh;
}