body {
  display: flex;
  flex-direction: column;
}

header {
  flex-shrink: 0;
}

body main {
  flex: 1;
}

.back-button {
  position: absolute;
  right: 0;
  bottom: 0;

  margin: 0 2rem 2rem;

  text-decoration: none;
}

iframe {
  width: 100%;
  min-width: 100% !important;
  height: 100%;

  border: 0;
}