Answer 1

Yes, you can link external styles like this.

<link rel="stylesheet" href="styles.css">

Answer 2

Link animate.css style like this.
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.0.0/animate.min.css"
/>
https://code.sololearn.com/WMagl11c0xsL/?ref=app