.banner{
    width: 100%;
    min-width: 1200px;
}
.banner img{
    width: 100%;
    display: block;
}
.knowledge {
    padding-top: 56px;
    padding-bottom: 60px;
}
.knowledge .item{
    margin-top: 116px;
    display: flex;
    justify-content: flex-end;
}
.knowledge .item .item_left{
    width: 392px;
    height: 205px;
    margin-top: 11px;
    margin-right: 107px;
}
.knowledge .item .item_left img{
    width: 100%;
}
.knowledge .item .item_right {
    width: 594px;
}
.knowledge .item .item_right .title{
    height: 25px;
    font-size: 18px;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: 500;
    color: #333333;
    line-height: 25px;
    -webkit-background-clip: text;
}
.knowledge .item .item_right .item_content{
    height: 176px;
    font-size: 16px;
    font-family: PingFangSC-Regular, PingFang SC;
    font-weight: 400;
    color: #666666;
    line-height: 22px;
    -webkit-background-clip: text;
    margin-top: 15px;
}
/* item2 */
.knowledge .item2{
    justify-content: flex-start;
}
.knowledge .item2 .item_right .item_content{
    margin-top: 29px;
}
.knowledge .item2 .item_left{
    width: 418px;
    height: 212px;
    margin-left: 84px;
}
/* item3 */
.knowledge .item3 .item_left{
    width: 362px;
    height: 237px;
    margin-top: 0;
    margin-right: 118px;
}
.knowledge .item3 .item_right .item_content{
    margin-top: 30px;
}
/* item4 */
.knowledge .item4{
    margin-top: 110px;
    justify-content: flex-start;
}
.knowledge .item4 .item_left{
    width: 420px;
    height: 213px;
    margin-top: 19px;
    margin-left: 92px;
}
.knowledge .item4 .item_right .item_content{
    margin-top: 30px;
}