.main {
    width: 90%;
    margin: 0 auto;
    background-color: #fff;
}

.about_nav a {
    width: 94px;
    height: 94px;
    border-radius: 100px;
    display: inline-block;
    margin-top: 60px;
    font-size: 14px;
    -moz-border-radius: 100px;
    -webkit-border-radius: 100px;
    position: relative;
}

.about_nav_box {
    width: 100%;
    height: 160px;
}

.about_nav {
    width: 980px;
    margin: 0 auto;
    text-align: center;
}

.about_nav a.a01,
.about_nav a.a02 {
    margin-right: 74px;
}

.about_nav a span {
    width: 94px;
    height: 94px;
    display: block;
}

.about_nav a b {
    font-weight: normal;
    margin-top: -40px;
    display: block;
    font-size: 14px;
    color: #8c979f;
}

.about_nav a.on b,
.about_nav a:hover b {
    color: #000;
}


.about_nav a.a01.on span {
    background: url(../images/a01.png) no-repeat;
}

.about_nav a.a02:hover span,
.about_nav a.a02 span {
    background: url(../images/a02hover.png) no-repeat;
}

.about_nav a.a05 span {
    background: url(../images/a05.png) no-repeat;
}

.about_nav a.a05:hover span {
    background: url(../images/a05hover.png) no-repeat;
}

.natural {
    width: 90%;
    margin: 0 auto;
    position: relative;
}

.contentgy {
    margin: 0 auto;
    overflow: hidden;
    text-align: center;
}

.natural_nav {
    height: 28px;
    line-height: 28px;
    margin: 30px 0;
}

.natural_nav a {
    height: 35px;
    line-height: 35px;
    padding: 0 20px;
    background-color: #ddd;
    display: inline-block;
    margin-right: 20px;
    font-size: 14px;
    border-radius: 4px;
}

.natural_nav a:hover,
.natural_nav a.on {
    background: #94cb0b !important;
    color: #fff !important;
}

.natural_content {
    /*width: 960px;*/
    padding: 0 10px 10px;
}

.tab-tit {
    text-align: center;
    margin: 0 0 20px;
}

.tab-tit h3 {
    font-weight: normal;
    color: #333;
    font-size: 18px;
    line-height: 30px;
}

.tab-tit p {
    color: #757575;
    font-size: 14px;
    line-height: 24px;
}

.natural_content .img_ul li {
    padding: 10px 15px;
    background: #f6f8f9;
    float: left;
    width: 270px;
    overflow: hidden;
    margin: 0 8px 20px;
    cursor: pointer;
    border: 1px solid #ebeef0;
}

.img_ul {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.natural_content .img_ul li.first {
    width: 80%;
    text-align: center;
    margin: 0 auto 20px;
    float: none;
}

.natural_content .img_ul li.first img {
    width: 100%;
    height: auto !important;
}

.natural_content .img_ul li.first {
    width: 80%;
    text-align: center;
    margin: 0 auto 20px;
    float: none;
}

.black03,
.black04,
.black-last {
    width: 100%;
    height: 100%;
    background: #000;
    opacity: 0.6;
    position: fixed;
    top: 0;
    left: 0;
    filter: alpha(opacity=60);
    -moz-opacity: 0.6;
    -khtml-opacity: 0.6;
    z-index: 300;
}

.big_img {
    position: fixed;
    top: 10%;
    left: 20%;
    z-index: 10000;
    width: 60%;
    overflow: hidden;
}

.big_img img {
    width: 80%;
}

.natural_content .img_ul li img {
    width: 270px;
    height: 384px;
}

.big_img02 {
    position: fixed;
    top: 10%;
    left: 30%;
    z-index: 10000;
    width: 35%;
    overflow: hidden;
}

.big_img-last {
    position: fixed;
    top: 10%;
    left: 30%;
    z-index: 10000;
    width: 35%;
    overflow: hidden;
}

@media screen and (min-width:960px) and (max-width:1440px) {
    .big_img img {
        width: 100%;
    }

    .big_img02 img {
        width: 100%;
    }

    .big_img-last img {
        width: 100%;
    }
}