* {
    margin: 0;
    padding: 0;
    list-style: none;
}

body {
    background-color: #f3f3f3;
}

.top {
    z-index: 2;
    background-color: white;
    width: 100%;
    position: fixed;
    height: 70px;
    top: 0;
}

.top .back {
    display: inline-block;
    width: 30px;
    height: 30px;
    position: absolute;
    font-size: 35px;
    left: 20px;
    top: 10px;

}
.top .back a{
    text-decoration: none;
    color: #000;
}
.top .center {
    width: 300px;
    height: 35px;
    line-height: 35px;
    margin: 20px auto;
    text-align: center;
}

.top .center p {
    font-size: 17px;
    line-height: 30px;
    color: #000;
}

.top .tool {
    background: url("https://fycoder.oss-cn-hangzhou.aliyuncs.com/web/xiyan/tool.png") no-repeat;
    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;
}

.bottom {
    width: 100%;
    height: 100px;
    position: fixed;
    bottom: 0;
    background-color: #fff;
}

.bottom img {
    width: 34px;
    height: 54px;
    margin-top: 23px;
}

.all_commodity {
    margin-top: 75px;
}

.commodity {
    width: 100%;
    height: 190px;
    background-color: #fff;
    margin-top: 5px;
    box-sizing: border-box;
}

.commodity p {
    margin-left: 20px;
}

.commodity .title {
    display: inline-block;
    height: 30px;
    line-height: 30px;
    font-size: 15px;
    margin-top: 10px;
}

.commodity .details {
    font-size: 13px;
}

.photo {
    margin-left: 15px;
    margin-top: 20px;
}

.photo li {
    float: left;
    width: 17%;
    margin-left: 5px;
}

.photo li div {
    width: 100%;
    display: inline-block;
    height: auto;
}

.photo li div img {
    width: 100%;
    height: 100%;
}

.bottom {
    width: 100%;
    height: 100px;
    position: fixed;
    left: 0;
    bottom: 0;
    border: 3px solid rgb(243, 243, 243);
    box-sizing: border-box;
    background-color: #fff;
}

.bottom ul {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding-top: 20px;
    box-sizing: border-box;
}

.bottom ul li {
    cursor: pointer;
    height: 60px;
    width: auto;
    text-align: center;
}


.bottom ul li img {
    height: 80%;
}