.banner{
  margin: 20px auto;
}
.insight.detail .description .index_nav ol a {
  color: #333;
  font-weight: 600;
  padding: 0 5px;
  text-decoration: none;
  transition: background-color ease .2s, color ease .2s;
}
.insight.detail .description .index_nav ol a:focus {
  color: #333;
}
@media (max-width: 550px) {
  .banner{
    width: 80%;
  }
}

@media (min-width: 550px) {
  .banner{
    margin: 20px 0;
  }
}