Conditional class in Astro

```astro
<div class={setCircle ? 'rounded-full' : 'rounded-lg'} />
<div class={setCircle ? 'rounded-full' : 'rounded-lg' + ' ' + sizeLarge ? 'max-w-3xl' : 'max-w-md'} />
```

Ref:

- https://github.com/snowpackjs/astro/issues/782