body {
  margin: 40px auto;
  max-width: 650px;
  line-height: 1.6;
  color: #444;
  padding: 0 10px;
  background-color: #f5f5f5;
  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";
}

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

.container {
  max-width: 800px;
  margin: 0 auto;
}

a {
  color: #000000;
  text-decoration: none;
}

button {
  background-color: #ffffff;
  color: #000000;
  border: none;
  padding: 10px 20px;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: bold;
}

p { margin:1 }

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

  a:link {
    color: #58a6ff;
  }

  a:visited {
    color: #8e96f0;
  }
}