You can add the cdn via a script tag like this:
<script src="https://unpkg.com/@material-ui/core@latest/umd/material-ui.development.js" crossorigin="anonymous"></script>
You can also take a look at the example here.
But quoting the docs, this is heavily discouraged:
?? Using this approach in production is discouraged though - the client has to download the entire library, regardless of which components are actually used, affecting performance and bandwidth utilization.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…