body {
  --text-color: #333333;
  --background-color: #fafafa;
}
body.dark-theme {
  --text-color: #e9e9e9;
  --background-color: #202020;
}

@media (prefers-color-scheme: dark) {
  body {
    --text-color: #e9e9e9;
    --background-color: #202020;
  }
  body.light-theme {
    --text-color: #333333;
    --background-color: #fafafa;
  }
}

body,
html {
  margin: 0;
  padding: 0;
  color: var(--text-color);
  background: var(--background-color);
  font-family: Roboto, sans-serif;
}

html {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100%;
}

* {
  box-sizing: border-box;
  font-family: Roboto, sans-serif;
}

main {
  display: flex;
  justify-content: center;
  flex-grow: 1;
  flex-direction: column;
  width: 70%;
}

main div {
  text-align: center;
}

h1 {
  font-size: 3rem;
  margin: 0.4rem 0;
}

footer {
  display: flex;
  justify-content: center;
  padding: 2rem 0;
}

footer > *:not(:last-child)::after {
  content: "|";
  padding: 0 0.4rem;
  opacity: 0.8;
}

#toggle-theme {
  cursor: default;
  user-select: none;
}