.header{margin:20px auto;height:50px;line-height:50px;padding-left:10px;background-color:#fafafa;color:#333}.knowledge{padding-bottom:50px}.knowledge .border{border:1px solid #d0d0d0}.knowledge .border .selection{height:50px;background-color:#f8f8f8}.knowledge .border .selection .item{display:inline-block;width:100px;height:50px;text-align:center;cursor:pointer}.knowledge .border .selection .item.selectedItem{background-color:#fff}.knowledge .border .selection .item .tip{display:inline-block;width:100px;height:2px;background-color:#f03b18;vertical-align:top}.knowledge .border .selection .item .tip.hideTip{display:none}.knowledge .border .content{padding:50px 80px}.knowledge .border .content.hide{display:none}.knowledge .border .content .list{margin-bottom:15px;color:#666}.knowledge .border .content .list .type{color:red;font-weight:700;margin-bottom:10px}@media (max-width:1023px){.knowledge .border .selection .item{position:relative;display:-webkit-box;display:-webkit-flex;display:flex;-webkit-box-align:center;-webkit-align-items:center;align-items:center;-webkit-box-pack:center;-webkit-justify-content:center;justify-content:center}.knowledge .border .selection .item .tip{position:absolute;top:0;left:0}}