.w1100 {

  width: 1100px;

  margin: 0 auto;

}

.cooperation {

  margin-top: 115px;

}

.cooperation .content img {

  width: 100%;

  height: 450px;

}

.cooperation .content .content_z {

  margin-top: 100px;

  padding: 0 15px;

  box-sizing: border-box;

}

.cooperation .content .content_z_tit {

  position: relative;

  font-size: 18px;

  font-weight: bold;

}

.cooperation .content .content_z_tit::before {

  position: absolute;

  content: '';

  display: block;

  top: 4px;

  left: -15px;

  width: 4px;

  height: 20px;

  background-color: #000;

}