pre {
  width: fit-content;
  background: #efefef;
  color: #000;
  padding: 5px;
  border-radius: 6px;
}

.perview-card {
  display: flex;
  align-items: center;
  height: 165px;
  margin-bottom: 8px;
}

.perview-card span {
  display: block;
  width: 50px;
  height: 165px;
  line-height: 165px;
  text-align: center;
  font-size: 24px;
  color: #fff;
  background: #3e3e3e;
  border-radius: 8px 0 0 8px;
}

@media screen and (max-width: 900px) {
  iframe {
    display: none;
  }
}