.zstp{
    width: 64.6875%;
    margin: 0 auto;
}
.tpzs_box{width: 100%; background-color: rgba(0, 0, 0, 0.8);}
.col-md-4 {
    width: calc(100%/4 - 2%);
    float: left;
    padding-left: 30px;
}
.col-md-4:nth-of-type(4n+1){padding-left: 0px;}
.about_tuloop{width: 64.6875%;
    margin: 0 auto;
    box-sizing: border-box
}
.img-responsive, .thumbnail > img, .thumbnail a > img, .carousel-inner > .item > img, .carousel-inner > .item > a > img {
    display: block;
    max-width: 100%; 
    height: auto;
}
.two{margin:50px auto;height:400px;width:100%;overflow:hidden;position:relative; }
.two ul{height:400px;width:100000px;position:absolute;left:0;}/*ul width的宽不能过小*/
.two ul li{display:block;float:left;margin:5px;height:390px;border-radius:5px;position:relative;}
.two ul li a{display:inline-block;height:390px;} 
.two ul li img{display:block;border-radius:5px;height:390px;}
.two ul li a span{height:0;display:block;background:rgba(0,0,0,0.4);position:absolute;bottom:0;color:#fff;font-size:0px;}
.two ul li a:hover span{height:80px;line-height:80px;font-size:20px;text-align:center;transition:all 0.7s;}
@media only screen and (max-width:1340px){
    .col-md-4 {
    padding-left: 25px;
}
.zstp{
    width: 98%;
    margin: 0 auto;
}
.about_tuloop{width: 98%}
}