.point{
    font-size: 14px;
    color: #808080;
    line-height: 90px;
    width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
}
.point a{
    color: #808080;
}
.content{
    width: 1200px;
    margin: 0 auto 50px;
    position: relative;
}
.content:after, .content:before{
    content: '';
    height: 0;
    display: table;
}
.content:after{
    clear: both;
}



.content_nav{
    width: 278px;
    text-align: center;
    border-bottom: 1px solid #e2e2e2;
    border-top: 1px solid #e2e2e2;
}
.content_nav ul li{
    height: 55px;
    line-height: 55px;
    border-left: 1px solid #e2e2e2;
    border-right: 1px solid #e2e2e2;
    cursor: pointer;
    font-size: 16px;
    color: #6f6f6f;
}
.content_nav ul li:nth-child(2n-1){
    background: #f8f8f8;
}
.content_nav ul li:nth-child(2n){
    background: #f1f1f1;
}
.content_nav ul li:hover{
    color: #e62f34;
    border-left: 1px solid #e62f34;
    background: rgba(0,0,0,0.1);
}
.content_nav ul li.left_red{
    color: #e62f34;
    background: white;
    border-left: 1px solid #e62f34;
}

.nav_change{
    width: 840px;
    border: 1px solid #e2e2e2;
    padding: 10px 30px 30px;
}
.change{}
.nav_change .change h1{
    border-bottom: 1px solid #cfcfcf;
    color: #0d0d0d;
    font-size: 18px;
    height: 64px;
    line-height: 64px;
    margin: 0 auto 30px;
    text-align: center;
    font-weight: normal;
}
.nav_change .change h2{
    font-size: 16px;
    margin-top: 20px;
    color: #999999;
    font-weight: normal;
}
.nav_change .change p{
    text-align: justify;
    text-indent: 28px;
    font-size: 14px;
    color: #777777;
    line-height: 28px;
    margin-top: 10px;
}
.nav_change .change img{
    width: 100%;
    cursor: pointer;
}
.big_img{
    position: absolute;
    left: 0;
    top: 0;
    background: white;
    height: 990px;
    width: 1200px;
    cursor: pointer;
}
.big_img img{
    height: 100%;
    display: block;
    margin: 0 auto;
    cursor: pointer;
}
.big_img span{
    display: block;
    position: absolute;
    right: 0;
    top: 0;
    cursor: pointer;
    padding: 5px 10px;
    border: 1px solid #999999;
    color: #666666;
    border-radius: 4px;
}