For anyone finding themselves here (as I did) thinking "how do I inspect this element to apply custom styles?", you'll need to enable the user agent shadow DOM to make these vendor elements accessible.
For WebKit (Safari) & Blink (Chrome,Edge,Opera,Brave) browsers, follow these steps:
- Open DevTools (Ctrl+Shift+I)
- Find the gear icon, top-right and click to open up the dropdown menu
- In the context menu that opens, under "Preferences", find "Elements" towards the bottom and enable "Show user agent shadow DOM"
As you can see, I'm a man of culture, if there is a dark theme, I use it
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