.left-back,
.right-back {
  position: fixed;
  width: 50%;
  height: 100%;
}

.left-back {
  left: 0;
  background-color: #F6F9FC;
}

.right-back {
  right: 0;
  background-color: #fff;
}

.main {
  position: relative;
  z-index: 1;
  width: 1200px;
  margin: 0 auto;
}

.menu {
  position: fixed;
  top: 130px;
  width: 200px;
}

.menu-tit {
  padding-left: 25px;
  font-size: 16px;
  color: #222222;
  line-height: 16px;
  height: 16px;
  font-weight: bold;
}

.menu-ul {
  margin-top: 37px;
}

.menu-ul li {
  position: relative;
  width: 200px;
  padding-left: 25px;
  height: 40px;
  line-height: 40px;
  color: #333333;
  cursor: pointer;
  box-sizing: border-box;
  margin-bottom: 10px;
}

.menu-ul li:last-child {
  margin-bottom: 0;
}

.menu-ul li.active {
  background-color: #fff;
  color: #E13B29;
}

.menu-ul li.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 40px;
  background: #E13B29;
}

.menu-item:last-child {
  margin-top: 70px;
}

.content-wrapper {
  width: 1000px;
  background-color: #ffffff;
  padding: 35px 0 0 53px;
  box-sizing: border-box;
  float: right;
  padding-bottom: 80px;
}

.content-wrapper img {
  width: 100%;
}

.footer {
  position: relative !important;
}

.header {
  position: -webkit-sticky !important;
  position: sticky !important;
}