bootstrap4.css
.jumbotron {
  padding: 2rem 1rem;
  margin-bottom: 2rem;
  background-color: #e9ecef;
  border-radius: 0.3rem;
}
bootstrap4.css
@media (min-width: 576px) {
  .jumbotron {
    padding: 4rem 2rem;
  }
}
bootstrap4.css
.jumbotron-fluid {
  padding-right: 0;
  padding-left: 0;
  border-radius: 0;
}