* {
    margin: 0;
    padding: 0;
    list-style: none;
}
body{
    -moz-user-select:none;/*火狐*/
    -webkit-user-select:none;/*webkit浏览器*/
    -ms-user-select:none;/*IE10*/
    user-select:none;
}
.box {
    width: 100%;
    height: 1100px;
    padding: 20px 10px;
}

.top {
    width: 100%;
    height: 40px;
    margin-bottom: 50px;
}

.top .back {
    width: 58px;
    height: 18px;
    position: absolute;
    top: 30px;
    left: 10px;
    background: url("https://fycoder.oss-cn-hangzhou.aliyuncs.com/web/xiyan/back.png");
    background-size: 100%;
}

.back a {
    display: inline-block;
    width: 29px;
    height: 18px;
    float: left;
}

.top .center {
    width: 80px;
    height: 35px;
    margin: 0 auto;
    text-align: center;
}

.top .center p:first-child {
    font-size: 20px;
    line-height: 20px;
    color: #000;
}

.top .center p:last-child {
    font-size: 15px;
    line-height: 20px;
    color: #787878;
}

.top .tool {
    background: url("https://fycoder.oss-cn-hangzhou.aliyuncs.com/web/xiyan/tool.png") no-repeat;
    filter:alpha(opacity=50);
    background-size: 100%;
    width: 75px;
    height: 35px;
    position: absolute;
    top: 25px;
    right: 20px;
}

.top .tool a {
    display: inline-block;
    width: 35px;
    height: 35px;
    float: left;
}

.show .commodity {
    width: 100%;
    height: 1050px;
}

.show .commodity ul li {
    margin-left: 10%;
    width: 35%;
    display: inline-block;
    margin-bottom: 50px;
}
.show .commodity a{
    width: 100%;
    height: 100%;
    display: inline-block;
}
.show .commodity ul li img {
    width: 100%;
    height: auto;

}