.main {
  width: 1000px;
  margin: 30px auto 0;
}
@media screen and (max-width: 768px) {
  .main {
    width: 100%;
  }
}
.main .article .title {
  font-size: 40px;
  text-align: center;
  margin-bottom: 50px;
}
.main .article .content {
  line-height: 2;
}
.main .article .content figure.highlight {
  background-color: #eee;
  border-radius: 3px;
  overflow: auto;
}
.main .article .content figure.highlight pre {
  font-family: Consolas, Cascadia Code, NSimSun, serif, sans-serif;
  font-size: 0.8em;
  line-height: 1.5;
}
.main .article .content figure.highlight .gutter {
  padding-left: 20px;
}
.main .article .content figure.highlight .code {
  padding-left: 10px;
}
.main .article-pn-nav {
  display: flex;
  justify-content: space-between;
}