body {
  margin: 0px;
}

#main-header {
  background-color: #676767;
  color: #ffffff;
  font-weight: bold;
  font-size: 22px;
  padding: 1em;
}

#main-body {
  margin: 3em;
  max-width: 1500px;
  width: 100%;
}

#beian-info {
  text-align: center;
  position: absolute;
  bottom: 0;
  width: 100%;
}

.main-header-nav {
  color: #ffffff;
  float: right;
  text-decoration: none;
}

.download-link {
  background-color: #1772f6;
  color: #ffffff;
  display: block;
  margin: 1em;
  padding: 1em;
  text-decoration: none;
  width: 30em;
}

.inline-multimedia {
  display: block;
  margin: auto;
  width: 60%;
}