.contentbox1{
    width: 1200px;
    display: flex;
    padding-top: 50px;
}
.islist{
    width: 1200px;
    text-align: center;
    display: flex;
    justify-content: center;
}
.islist img{
    border-radius: 20px;
    border: 1px solid #F6F6F6;
    display: inline;
}
.nextleft{
    float: left;
    line-height: 650px;
    text-align: center;
}
.nextleft img{
    display: inline;
}
.nextright{
    float: right;
    line-height: 650px;
    text-align: center;
}
.nextright img{
    display: inline;
}