.aboutbanner {
  width: 100%;
  height: 500px;
  background: url(../images/aboutbanner1.jpg) no-repeat;
  background-size: cover; }

.switch {
  width: 100%;
  height: 80px;
  border-top: 1px solid #bdbdbd;
  border-bottom: 1px solid #bdbdbd;
  margin-top: 48px; }

.switchthree {
  width: 899px;
  height: 100%;
  margin: auto; }

.jianjie {
  width: 50%;
  height: 100%;
  border-left: 1px solid #bdbdbd;
  border-bottom: 4px solid #313131;
  float: left; }

.wenhua {
  width: 50%;
  height: 100%;
  border-left: 1px solid #bdbdbd;
  border-right: 1px solid #bdbdbd;
  float: left; }

h2 {
  color: #313131;
  font-size: 22px;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  line-height: 80px; }

.nav-div {
  display: flex; }
  .nav-div .nav-item {
    flex: 1;
    border-bottom: none; }
  .nav-div .nav-item:last-child {
    border-right: 1px solid #bdbdbd; }
  .nav-div .nav-item.active {
    border-bottom: 4px solid #313131; }

.about-content-div h2 {
  color: #313131;
  font-size: 22px;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  line-height: 80px; }
.about-content-div p {
  font-size: 22px;
  color: #313131;
  text-indent: 2em;
  line-height: 50px;
  font-family: Arial, Helvetica, sans-serif; }

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