.top_img {
    width: 100%;
    height: 350px;
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    position: relative;
}

.content {
    background-color: #f5f5f5;
}

div.box {
    width: 1200px;
    display: flex;
     align-items: flex-start;
    margin: 0 auto;
    padding-top: 60px;
    padding-bottom: 80px;

}

ul.list {
    width: 200px;
    height: auto;
    /* 去除li前面的黑点 */
    list-style: none;
    /* 文字居中显示 */
    text-align: center;
    margin-right: 20px;
    background-color: #fff;
}

ul.list>li {

    /* 光标变成小手状 */
    cursor: pointer;
    height: 60px;
    line-height: 60px;
    color: #333;
    font-size: 16px;
}

div.main {
    width: 980px;
    height: auto;
    background-color: #fff;
    padding: 20px;
    padding-bottom: 40px;
}

.main h1 {
    text-align: center;
    font-size: 16px;
    color: #333;
    line-height: 60px;
}

.main p {
    color: #666;
    font-size: 12px;
    line-height: 30px;
}
.main0,
.main1,
.main2,
.main3,
.main4,
.main5,
.main6,
.main7,
.main8 {
    width: 100%;
    height: 100%;
    display: none;
}



.list li.checked {
    background: #ffefe5;
    color: #fe6600;
    border-left: 1px solid #fe6600;
}

div.checked {
    display: block;
}