html, body {
  margin: 0;
  padding: 0;

  font-size: min(4vh, 4vw);
}

header {
  background-image: url(header.jpg);
  width: 100%;
  height: 24vw;
  background-size: cover;
}

h1 {
  font-size: 1.2em;
}

section {
  display: flex;
  flex-direction: column;
  align-items: center;
}