:root {
  --altura: 100vh;
}
* {
  color-scheme: dark;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
}
main {
  display: flex;
  height: 100vh;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 2vh;
}