html {
  height: 100%;
  font-size: 18px;
}
@media screen and (min-width: 576px) {
  html {
    font-size: 16px;
  }
}

body {
  font-family: sans-serif;
  text-align: center;
  margin: 0;
}

h1 {
  font-size: 3rem;
  margin: 1rem 0;
}

p {
  font-size: 1.125rem;
  margin: 1rem 0;
}

body {
  height: 100%;
}

.container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 80vw;
  max-width: 30rem;
  margin: 0 auto;
}

.container:before {
  content: "";
  display: block;
  flex-grow: 1;
  max-height: 100vw;
}

.container:after {
  content: "";
  display: block;
  flex-grow: 2;
  max-height: 100vw;
}