#banner {
  background-image: none;
  background-color: #000;
  display: flex;
}

#banner-left {
  width: 85%;
}

#banner-right {
  width: 15%;
}

.anchor {
  height: 0;
  line-height: 0;
  padding: 0;
}

#containers {
  display: flex;
}

#main {
  background-color: #fff;
  color: #0f0f0f;
  padding: 60px 20px 20px 20px;
  width: 85%;
}
 
#main a {
  color: #2196f3;
}

#sidebar {
  min-width: 235px;
  width: 15%;
  padding: 64px 0 64px 6px;
  background-color: #fafafa;
  text-align: left;
}

#sidebar a {
  font-weight: 500;
  font-size: 12px;
  line-height: 14px;
  color: #757575;
  margin: 0px 8px;
  padding: 5px 10px;
}

#sidebar a.active {
  border-left: solid 3px #2196f3;
  border-radius: 3px;
  color: #2196f3;
}

#sidebar a:hover {
  color: #2196f3;
}

.side-submenu {
  padding-left: 16px;
}

.side-submenu > li {
  padding: 2px 0;
}

.side-menu > li:nth-last-child(1) {
  padding-top: 16px;
}

.side-menu > li {
  padding: 8px 0;
}

.side-menu {
  position: relative;
}

#main pre {
  font-family: Courier, monospace;
  white-space: pre;
  background-color: #11171a;
  color: #fff;
  padding: 20px;
  overflow-x: auto;
  line-height: normal;
}

#main pre code {
  color: #fff;
  padding: 0px;
}

.token {
  color: #a0fbaa;
}

.token.operator {
  color: #f5b83d;
}

#main code {
  color: #e53935;
  background-color: rgba(38, 50, 56, 0.05);
  font-family: Courier, monospace;
  border-radius: 2px;
  border: 1px solid rgba(38, 50, 56, 0.1);
  padding: 0px 5px;
  font-size: 13px;
  font-weight: 400;
  word-break: break-word;
}

hr {
  border: none;
  height: 1px;
  color: #999;
  background-color: #999;
  margin: 64px auto;
}

.video {
  width: 560px; 
  height: 315px; 
}

@media only screen and (max-width: 900px) {
  .video  {
    width: 280px; 
    height: 158px;
  }
}