Bordered surface container.
Standard card surface: padding, border, rounded corners, theme-aware background. Compose with header + footer slots for richer patterns.
import { Card } from "@/components/ui/card";
<Card>
<h3>Pro plan</h3>
<p>10 agents, 20 humans, 200 workspaces.</p>
</Card>components/ui/ folder. You own the code.