body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #f5f5f5;
}

main {
  width: 70%;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  margin: 4em 0 2em;
  overflow-y: hidden;
}

iframe {
  min-height: 540px;
}

@media screen and (max-width: 790px) {
  main {
    width: 100%;
  }
}

@media screen and (min-height: 960px) {
  iframe {
    min-height: 800px;
  }
}