*{ margin: 0; padding: 0;-webkit-box-sizing: border-box;box-sizing: border-box;font-family:"微软雅黑","Microsoft YaHei","sans-serif";}
img{ vertical-align: middle;}
.nav_img{ width: 100%;overflow: hidden;min-width: 620px;}
.nav_img img{max-width: 100%;}
.company{ font-size: 45px; color: #90c320;max-width: 1190px;min-width: 620px; height: 45px; margin: 0 auto; margin-top: 50px; margin-bottom: 100px;}
.content_a{ max-width: 1190px;min-width: 620px; margin: 0 auto; overflow: hidden; margin-bottom: 30px;}
.content_a img{ float: left;}
.content_a div{ width: 430px; overflow: hidden; float: right; margin: 20px 20px 0 0;}
.content_a div h1{font-size: 40px; color: #000; margin-bottom: 50px;}
.content_a div p{font-size: 16px; color: #000; line-height: 30px;}
.content_b{ max-width: 1190px;min-width: 620px;;margin: 0 auto; overflow: hidden; margin-bottom: 100px;}
.content_b img{ float: right;}
.content_b div{ width: 430px; overflow: hidden; float: left; margin: 150px 30px;}
.content_b div p{font-size: 16px; color: #000; line-height: 30px;}