5 i card in bootstrap 4 example

Example 1: bootstrap card change image

.card-img-top {
    width: 100%;
    height: 15vw;
    object-fit: cover;
}

Example 2: responsive card header

<div class="card" style="width: 18rem;">
  <div class="card-header">
    Featured
  </div>
  <ul class="list-group list-group-flush">
    <li class="list-group-item">Cras justo odio</li>
    <li class="list-group-item">Dapibus ac facilisis in</li>
    <li class="list-group-item">Vestibulum at eros</li>
  </ul>
</div>