ul,
li {
  padding: 0;
  margin: 0;
}
html {
  height: 100%;
}
body {
  margin: 0;
  font-size: 16px;
  height: 100%;
  width: 100%;
  display: flex;
}
.left-nav {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  height: 100%;
  display: flex;
  pointer-events: none;
}

.sidebar {
  flex: 1;
  min-width: 90px;
  display: flex;
  background: #f5f5f5;
  padding: 0px 10px;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
  height: 100%;
  pointer-events: auto;
}
.sidebar > header {
  padding-top: 20px;
  color: #000;
  font-weight: bold;
  font-size: 22px;
}
.sidebar > main {
  margin-top: 20px;
  flex: 1;
  overflow-y: auto;
  display: flex;
}
.sidebar > footer {
  font-size: 12px;
  color: rgba(0, 0, 0, 0.6);
}
.sidebar main > ul {
  padding-left: 25px;
  flex: 1;
  list-style: none;
  text-align: left;
}
.sidebar ul ul {
  padding-left: 15px;
}
.sidebar li {
  height: 24px;
  overflow: hidden;
  margin: 24px 0;
}
.sidebar li.show {
  height: unset;
}
.sidebar ul a {
  display: block;
  height: 24px;
  line-height: 24px;
  color: rgba(0, 0, 0, 0.4);
  text-decoration: none;
  transition: color 0.15s;
}
.sidebar a:hover {
  color: #000;
}
.main-content {
  display: flex;
  width: 100%;
}
.content {
  margin-left: 10px;
  flex: 5;
  padding: 48px 40px;
  background: #fdfcfd;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.03);
}
.content section {
  margin-bottom: 48px;
}
.content h2 {
  margin-top: 0;
  color: #222;
  border-bottom: 2px solid #eee;
  padding-bottom: 8px;
}