:root {
  font-family: "Helvetica Neue", Arial, sans-serif;
}

body {
  --top: 6em;
  margin: 0;
  font-family: "Open Sans", sans-serif;
  font-optical-sizing: auto;
  font-size: 1.4em;
  color: black;
  background: whitesmoke;
}

li {
  text-align: left;
}
main {
  align-items: center;
  box-sizing: border-box;
  display: flex;
  flex-flow: column;
  justify-content: center;
  text-align: center;
  min-height: 100dvh;
  padding-top: var(--top);
  gap: 1.5em;
}

input,
button {
  font-size: inherit;
}

#instruction {
  padding: 1em;
  margin: calc(var(--top) - 3em) auto calc(-1 * var(--top));
  text-align: center;
}

div[show-after] {
  display: none;
  max-width: 50em;
  margin: 0 1.5em;
  border-top: .05em solid;
}