.introduct_box{width: 100%;font-size: 16px;background-color: #f9f9f9;border: 1px solid #dfdfdf;overflow: hidden;background-color: #f9f9f9;border: 1px solid #dfdfdf;}
.introduct-content {line-height: 33px;overflow: hidden;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp:12}
.introduce_box{background-color: #f9f9f9;height:438px;font-size:16px;padding:20px}
@media ( max-width :768px) {
    .introduce_box{height:auto}
}