.content {
    /* height: 570px; */
    padding: 26px 7px;
    box-sizing: border-box;
    overflow: hidden;
}
.z_item{
    float: left;
    width: 350px;
    height: 80px;
    margin: 0 28px 28px 0;
}
.z_item img{
	width: 100%;
	height: 100%;
}
.content .z_item:nth-child(3n){
    margin-right: 0;
}
/*归档专题*/
.guid{display: inline-block;width: 200px;background: red;color: white;font-weight: bold;text-align: center;height: 35px;line-height: 35px;font-size: 18px;margin-right: 100px}


@media screen and (max-width: 768px) {
    body {
        height: auto;
        background-size: 100% 100%;
    }
}