html, body {
  height: 100%;
  margin: 0;
}

body {
  color: #232b24;
  background: #fff;
  font-family: system-ui, sans-serif;
}

main {
  box-sizing: border-box;
  max-width: 39rem;
  margin: 0 auto;
  padding: min(14vh, 7rem) 1.5rem 2rem;
  line-height: 1.65;
}

h1 { font-size: 1.65rem; }

button {
  font: inherit;
  padding: .4rem .85rem;
  border: 1px solid #365d43;
  border-radius: .35rem;
  background: #365d43;
  color: #fff;
  margin: 0 .6rem .6rem 0;
  cursor: pointer;
}

a { color: #275438; }

iframe {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}