body {
  background-image: url("../img/jj-ying-7JX0-bfiuxQ-unsplash-l.jpg");
  font-family: 'Montserrat', sans-serif;
}

form {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  margin: 30px;
  padding: 10px;
  background-color: white;
}

h1 {
  margin-top: 20px;
}

img {
  margin-top: 100px;
}

.form-check {
  padding: 5px 25px;
}

.form-floating {
  padding-bottom: 5px;
}

@media screen and (max-width: 991px) { /* tablet */

  body {
    background-image: url("../img/jj-ying-7JX0-bfiuxQ-unsplash-m.jpg");
  }

  form {
    width: 60%;
  }
}

@media screen and (max-width: 530px) {
  body {
    background-image: url("../img/jj-ying-7JX0-bfiuxQ-unsplash-sm.jpg");
  }

  img {
    margin-top: 20px;
  }
}