.card-img-top {
  width: auto;
  height: 15vh;
}

@media (max-width: 736px) {
  .card-img-top {
    width: 20%;
    height: 10vh;
  }

  .jumbotron {
    width: 70%;
    height: 0;
    margin: auto auto;
  }

  .card {
    margin: auto;
  }

  .card-text {
    font-size: 10px;
  }
}