:root {
    --jumbotron-padding-y: 3rem;
  }
  
  .jumbotron {
    padding-top: var(--jumbotron-padding-y);
    padding-bottom: var(--jumbotron-padding-y);
    margin-bottom: 0;
    background-color: #fff;
  }
  @media (min-width: 768px) {
    .jumbotron {
      padding-top: calc(var(--jumbotron-padding-y) * 2);
      padding-bottom: calc(var(--jumbotron-padding-y) * 2);
    }
  }
  
  .jumbotron p:last-child {
    margin-bottom: 0;
  }
  
  .jumbotron-heading {
    font-weight: 300;
  }
  
  .jumbotron .container {
    max-width: 40rem;
  }
  
  footer {
    padding-top: 1.5rem;
    padding-bottom: 2.5rem;
  }
  
  footer p {
    margin-bottom: .25rem;
  }
  
  .box-shadow { box-shadow: 0 .25rem .75rem rgba(0, 0, 0, .05); }

#referenties img {
  width: 100%;
  margin: 15px;
}

input {
  margin: 15px 0;
}
textarea {
  margin: 15px 0;
}

form{
  margin-bottom: 140px;
}