Unable to select <slot> using CSS Selector, how to style it to make "Launch" text color red?

As per above screenshot, I am trying to style web component , and content inside slot reveal/pointing to "Launch" when clicked. How can I style slot to apply text colour to "Launch". I am struggling to select slot using css selector. Any help/suggestions would be helpful.

I already tried to apply style using below selector but did not work for me.

sl-tab::part(base)::slotted(*) { color: red; }

I figured out how to style Launch with another way using:

sl-tab[active]::part(base) {
  color: red;
}