.only_back{background-image: url(../img/backpic_relation.png);background-size: 100% 100%; background-repeat: no-repeat;height: 340px;width: 1000px;}
.first_content{width:800px;height: 1200px;padding-top:60px;margin-left: 200px;}
.main_title{font-size: 3.5rem;font-weight: 300;line-height: 1.2;}
.main_two_title{font-size: 18px; font-weight: 300;display: block;margin-top: 20px;width: inherit;padding-bottom: 20px;color: dimgray;font-family: "微软雅黑";}
.main_two_comment{font-size: 18px; font-weight: 300;text-indent: 2em;font-family: "微软雅黑";line-height: 30px;display: block;margin-top: 30px;}
.link_container{width: 180px;height: 200px;position: fixed;top:0px;left: 0px;margin-top:478px;z-index: 10000;background-color: white;}
.link_container>ul{}
.link_container>ul>li{list-style: none;border-bottom: 1px solid darkgray;box-sizing: border-box;}
.link_container>ul>li.is_first{border-top: 1px solid darkgray;}
.link_container>ul>li.active{border-right: 4px solid rgb(0,170,231);}
.link_container>ul>li:hover a{color:black;}
.link_container>ul>li>a{display: block;width:200px;height: 50px;line-height: 50px;text-align: center;text-decoration: none;font-size: 24px;font-family: "微软雅黑";color: rgb(136,136,136);}
.link_container>ul>li>a.active{color: rgb(0,170,231);}
/*企业宗旨*/
.second_content{width:800px;height: 920px;padding-top:60px;margin-left: 200px;}
.second_content>div{width: inherit;height: 36px;padding-top: 10px;padding-bottom: 10px;box-sizing: content-box;}
.second_content>div.not_last{border-bottom: 1px solid lightgrey;}
.second_content>div>.zz_title{width: 160px;height: 36px;float: left;font-size: 24px;font-weight: 900;line-height: 36px;}
.second_content>div>.zz_content{width: 640px;height:36px;float: left;}
.second_content>div>.zz_content{font-size: 18px;line-height: 36px;display: block;width: 640px;}
.second_content>img{display: block;}
/*发展历程*/
.third_content{width:800px;height: 610px;padding-top:60px;margin-left: 200px;}
.third_content>.year{width: 100px;font-size: 24px;font-weight: 500;float: left;}
.third_content>.year>.year_2018{}
.third_content>.year>.y2017_2018{height: 200px;margin-left: 30px;border-left: 1px solid lightgrey;}
.third_content>.year>.year_2017{}
.third_content>.year_content{width: 700px;float: left;}
.third_content>.year_content>.year_content_2018{font-size: 18px;line-height: 36px;padding-bottom: 14px;box-sizing: content-box;border-bottom: 1px solid lightgrey;}
.third_content>.year_content>.year_content_2018>p{}
.third_content>.year_content>.year_content_2018>p>span{font-size: 24px;font-weight: 500;}
.third_content>.year_content>.year_content_2017{font-size: 18px;line-height: 36px;padding-bottom: 14px;padding-top: 14px;box-sizing: content-box;border-bottom: 1px solid lightgrey;}
.third_content>.year_content>.year_content_2017>p{}
.third_content>.year_content>.year_content_2017>p>span{font-size: 24px;font-weight: 500;}
/*合作伙伴*/
.fourth_content{width:800px;height: 640px;padding-top:60px;margin-left: 200px;}
.friend_container{border-bottom: 1px solid lightgrey;height: 160px;padding-top: 20px;box-sizing: content-box;}
.friend_container.is_first{border-top: 1px solid lightgrey;}
.friend_container>.friend_img{width: 140px;height: 160px;float: left;}
.friend_container>.friend_img>a>img{cursor: pointer;}
.friend_container>.friend_content{width:660px;height: 160px;float:left;padding-left: 16px;font-size: 18px;line-height: 36px;box-sizing: border-box;}