body {
  max-width: 650px;
  margin: 40px auto;
  padding: 0 10px;
  font: 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  color: #444
}

h1,
h2,
h3 {
  line-height: 1.2
}

@media (prefers-color-scheme: dark) {
  body {
    color: #c9d1d9;
    background: #0d1117
  }

  a:link {
    color: #58a6ff
  }

  a:visited {
    color: #8e96f0
  }
}

.text-center {
  text-align: center;
}

.center {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}