@media all and (max-width: 640px) {
  .intro {
    min-height: 100vh;
  }
  .intro > div{
    background-size: 60%;
  }
  .intro h2 {
    font-size: 4.45vw;
    line-height: 1.6em;
    margin-top: -5vh;

  }
  .intro img {
    width: 125px;
  }
  .intro .sidebar-form-btn {
    font-size: 3.75vw;
    width: 60vw;
    height: 10vw;
    margin-top: 25px;
  }
}