HTML

bootstrap 3 cards example

<div class="panel panel-default">
  <div class="panel-heading">Panel Heading</div>
  <div class="panel-body">Panel Content</div>
  <div class="panel-footer">Panel Footer</div>
</div>

bootstrap 5 card simple

<div class="card" style="width: 18rem;">
  <img src="..." class="card-img-top" alt="...">
  <div class="card-body">
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
  </div>
</div>

bootstrap card component

<div class="card" style="width: 18rem;">
  <img class="card-img-top" src="..." alt="Card image cap">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="#" class="btn btn-primary">Go somewhere</a>
  </div>
</div>

cards bootstrap examples

<div class="card" style="width: 18rem;">
 
</div>