.videoWrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
}
.videoWrapper iframe {
  position: absolute;
  width: 100%;
  height: 100%;
  max-width: 800px;
  max-height: 450px;
}

a {
  text-decoration: none;
}

form {
  margin: auto;
  width: 80%;
  max-width: 800px;
}

h1.form-header {
  font-size: 40pt;
  font-weight: 900;
}