.only_back{background-image: url(../img/backgroup1_default.png);background-size: 100% 100%; background-repeat: no-repeat;height: 340px;width: 1000px;}
.first_content{width:inherit;height: 240px;padding-top:60px;}
.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;display: block;width: inherit;border-bottom: 1px solid gainsboro;padding-bottom: 30px;color: dimgray;font-family: "微软雅黑";}
.second_content{width:inherit;height: 950px;}
.second_content>.erow{width: inherit;height: 260px;}
.second_content>.erow.not_first{margin-top: 35px;}
.second_content>.erow>.news_card{width: 310px;height: 260px;float: left;padding: 20px;box-shadow: 2px 2px 2px 2px #f1f1f1;border: 1px solid rgba(0,0,0,.125);border-radius: .25rem;cursor: pointer;-moz-user-select: none;-ms-user-select: none;-webkit-user-select: none;}
.second_content>.erow>.news_card.not_first{margin-left: 35px;}

.second_content>.erow>.news_card>.news_card_content{width:270px;height: 150px;display: none;color: rgb(128, 128, 128); box-sizing: border-box; font-size: 14px; line-height: 26px;font-family: "微软雅黑";}
.second_content>.erow>.news_card:hover{margin-top: -8px;transition: margin-top 0.3s linear};
.second_content>.erow>.news_card>.news_card_img{width:270px;height: 150px;}
.second_content>.erow>.news_card>.news_card_title{width: 270px;height: 70px;padding-top: 10px;}
.second_content>.erow>.news_card>.news_card_title>a{color:rgb(41,181,235);font-size: 20px;font-weight: 900;text-decoration: none;font-family: "微软雅黑";}}