body {
  margin: 40px;
  background-color: #e1e1e1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.center-content {
  position: fixed;
  bottom: 0;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 10px 0;
}
h1 {
  font-size: 4em;
}

.link {
  font-size: 2em;
}

iframe {
  border-radius: 12px;
}

a {
  margin: 0;
  padding: 0;
  border: none;
  vertical-align: baseline;
  display: inline-block;
  line-height: 1;
}