Finding ready-to-use components

Is there a website to find loads of styled components? I got a task to prepare small form with a custom checkbox like this:

and custom 'required icon' like this: .

And though I can make them on my own with CSS styling, I feel that those are elements, which should be reusable and easy to access by web/library somehow (I'm using react-bootstrap and styled-components for styling), but I don't know where to look for them.

Any help and links widely appreciated ;)