* {
  position: relative;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
:root {
  --color-background: #fff;
  --color-primary: #222;
  --color-secondary: #666;
}
html {
  height: 100%;
}
body {
  font-family: "Segoe UI Light", "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.1em;
  background: var(--color-background);
  width: 100%;
  height: 100%;
  font-size: 72px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
main {
  width: 100%;
  padding: 0 24px;
  margin: auto;
  top: 50%;
  transform: translateY(-55%);
  text-align: center;
}
h1 {
  font-size: 1em;
  color: var(--color-primary);
}
h2 {
  font-size: 0.5em;
  font-weight: lighter;
  color: var(--color-secondary);
}

@media only screen and (max-width: 640px) {
  body {
    font-size: 48px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #222;
    --color-primary: #ddd;
    --color-secondary: #999;
  }
}