.about-content{
    width: 100%;
    height: 2870px;
}
.about-content .content-item {
    width: 100%;
    height: 574px;
    font-size: 18px;
    color: #444444;
    float: left;
}
.about-content  .content-item .content-box{
    width: 1200px;
    margin: 0 auto;
}
.content-item .content-box .left-img{
    width: 600px;
    height: 428px;
    overflow: hidden;
    float: left;
    margin-top: 80px;
}
.content-item .content-box  .right-img{
    width: 600px;
    height: 428px;
    overflow: hidden;
    float:right;
    margin-top: 80px;
}
.content-item .content-box .left-img img{
    width: 600px;
}
.content-item .content-box .right-text{
    width: 600px;
    float: left;
    margin-top: 80px;
    padding-left: 30px;
}
.content-item .content-box .left-text{
    width: 600px;
    float: left;
    margin-top: 80px;
    padding-right: 30px;
}
.content-item .content-box .right-text img,.content-item .content-box .right-text p{
    float: left;
}
.content-item:nth-child(odd){
    background: #ffffff;
}
.content-item:nth-child(even){
    background: #f2f1f1;
}