body {
  background-color: #0d1117;
  color: #e6e6e6;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 10px;
}


h1, nav, footer {
  text-align: center;
}


h2, figure, audio, iframe {
  display: block;
  margin: 0 auto;
  text-align: center;
}

header {
  border-bottom: 2px solid #444;
  padding-bottom: 10px;
}

nav a {
  color: #9ad0f5;
  text-decoration: none;
  margin: 0 10px;
}

nav a:hover {
  text-decoration: underline;
}

figure {
  text-align: center;
  margin: 20px auto;
}

figcaption {
  font-style: italic;
  color: #ccc;
}

footer {
  margin-top: 40px;
  border-top: 1px solid #333;
  padding-top: 10px;
}


table {
  margin: 20px auto;
  border-spacing: 20px;
}

td {
  text-align: center;
  vertical-align: top;
}

figure img {
  width: 300px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}
main {
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.6;
  padding: 10px 20px;
}