header {
  .logo {
    height: 120px;
    img {
      display: block;
      height: 46px;
      margin: 37px 0;
    }
  }
  nav {
    position: relative;
    z-index: 99;
    height: 120px;
    &>ul {
      height: 120px;
      &>li {
        float: left;
        position: relative;
        &>a {
          height: 120px;
          line-height: 120px;
          margin-left: 15px;
          display: block;
          font-size: 16px;
          color: #333333;
          position: relative;
          overflow: hidden;
          img {
            display: block;
            margin-top: 51px;
          }
          &::after {
            position: absolute;
            left: 0;
            bottom: 0;
            content: "";
            display: block;
            width: 100%;
            height: 4px;
            background-color: #fff;
          }
        }
        &>ul {
          display: none;
          position: absolute;
          top: 120px;
          left: 0;
          width: 500px;
          li {
            float: left;
            a {
              color: #fff;
              display: inline block;
              height: 50px;
              line-height: 50px;
              margin-left: 15px;
              margin-right: 5px;
              font-size: 14px;
            }
          }
        }
        &:hover {}
        &.on {
          a {
            &::after {
              background-color: #36adcf;
            }
          }
        }
      }
    }
  }
}

.sub-nav {
  height: 50px;
  background: url(../images/er_nav_bg.png);
  position: absolute;
  z-index: 90;
  width: 100%;
  left: 0;
  display: none;
}

article {
  margin-top: 0;
}