Use <Card.Body> to pad content inside a <Card>.
<Card>
<Card.Body>This is some text within a card body.</Card.Body>
</Card>
//
<Card body>This is some text within a card body.</Card>
Use <Card.Body> to pad content inside a <Card>.
<Card>
<Card.Body>This is some text within a card body.</Card.Body>
</Card>
//
<Card body>This is some text within a card body.</Card>