/* Emerald Valley Library - Interactive Mathematics, generated by Mathigon Studio */
.timeline {
  position: relative;
  height: 160px;
  margin: 2em 0;
  border-bottom: 2px solid #ccc;
}
.timeline .timeline-item {
  position: absolute;
  width: 12px;
  height: 12px;
  background: #ccc;
  border-radius: 20px;
  margin-left: -6px;
  bottom: -7px;
}
.timeline .timeline-panel {
  position: absolute;
  width: 140px;
  left: -64px;
  bottom: 20px;
}
.timeline .timeline-panel p {
  margin: 0;
  line-height: 1.3;
  font-size: 16px;
  text-align: center;
}
.timeline .timeline-panel img {
  width: 120px;
  height: 80px;
  margin: 0 auto 8px;
  display: block;
}

.video-wrap {
  background: black;
  position: relative;
  height: 0;
  padding-bottom: 56.25%;
}
.video-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}