body {
  font:
    1rem/1.5 system-ui,
    sans-serif;
  margin: 0;
  background: #10141c;
  color: #eef2f8;
}
main {
  max-width: 30rem;
  margin: 15vh auto;
  padding: 2rem;
}
a {
  color: #91c7ff;
}
button {
  font: inherit;
  margin: 1rem 0;
}
[hidden] {
  display: none;
}