.nav {
  margin-bottom: 20px;
}

.nav a {
  text-decoration: none;
  color: #004080;
  font-weight: bold;
}

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

.video-container {
  position: relative;
  width: 100%;
  max-width: 1000px;
  /* widen page feel */
  margin: 30px auto;
  padding-top: 56.25%;
  /* 16:9 aspect ratio */
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 10px;
}

.content {
  max-width: 1000px;
  margin: 0 auto;
  /* center content */
  padding: 0 20px;
  /* small side padding on mobile */
}

.content-image {
  width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
  border-radius: 8px;
  /* optional */
}

.text-normal {
  font-size: 18px;
  line-height: 1.6;
}

.text-small {
  font-size: 15px;
}

.text-large {
  font-size: 20px;
}

.bibtex {
  background: #f7f7f7;
  padding: 15px;
  border-radius: 6px;
  font-size: 14px;
  overflow-x: auto;
}