index.css

body {
  background-color: #fff;
  color: #333;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.42857143;
  margin: 0 30px;
}

p {
  margin: 0 0 10px;
}

a {
  color: #337ab7;
  text-decoration: none;
}

a:focus, a:hover {
  color: #23527c;
  text-decoration: underline;
}

h1, h2 {
  margin-bottom: 10px;
  margin-top: 20px;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.1;
  color: inherit;
}

header {
  text-align: center;
}

h1 {
  font-size: 36px;
}

#subtitle {
  color: #777;
  font-size: 23px;
  font-weight: 400;
  line-height: 1;
  margin-top: 13px;
}

#authors-affiliations {
  margin-bottom: 40px;
  text-align: center;
}

.github-corner:hover .octo-arm {
  animation: octocat-wave 560ms ease-in-out
}

@keyframes octocat-wave {
  0%, 100% {
    transform: rotate(0)
  }
  20%, 60% {
    transform: rotate(-25deg)
  }
  40%, 80% {
    transform: rotate(10deg)
  }
}

@media (max-width: 500px) {
  .github-corner:hover .octo-arm {
    animation: none
  }

  .github-corner .octo-arm {
    animation: octocat-wave 560ms ease-in-out
  }
}

h2 {
  font-size: 30px;
}

pre {
  background-color: #f5f5f5;
  border: 1px solid #ccc;
  border-radius: 4px;
  color: #333;
  display: block;
  font-size: 13px;
  line-height: 1.42857143;
  margin: 0 0 10px;
  padding: 10px;
  word-break: break-all;
  word-wrap: break-word;
}

pre, code {
  font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
}

pre code {
  background-color: transparent;
  border-radius: 0;
  color: inherit;
  font-size: inherit;
  padding: 0;
  white-space: pre-wrap;
}