* {
  margin: 0;
  padding: 0;
}
body {
  background-color: cornsilk;
}
h2 {
  margin-top: 10px;
  margin-bottom: 10px;
}
.main_container {
  width: 90vw;
  margin: 0 auto;
}
img {
  width: 100%;
}
iframe {
  border: 0;
  width: 90vw;
  height: 60vw;
}
figcaption {
  margin-bottom: 20px;
}
.information {
  margin-top: 20px;
}
li > ul > li {
  font-size: smaller;
}
.index {
  position: fixed;
  right: 50px;
  bottom: 50px;
}