.about_banner{width: 100%;height: auto;max-height: 500px;zoom: 1;overflow: hidden;
}
.about_banner img{width: 100%;
}

.about_title{width: 1200px;margin: 0 auto;
}
.garden_title {min-width: 1200px;width: 1200px;height: 90px;text-align: center;margin-bottom: 16px;background: url(../img/title-bg.png)center bottom no-repeat;margin: 0 auto;margin-top: 50px;}
.garden_title h2 {font-size: 40px;color: #444444;}
.garden_title p {font-size: 18px;color: #444444;}

.about_text{width: 900px;font-size: 18px;line-height: 34px;margin: 30px auto;text-indent: 2em;
}


.course_c{width:1200px;margin:0 auto 50px;position:relative;padding:30px 50px 0px;}
.course_c:after{content:'';display:block;width:4px;height:100%;position: absolute;top:20px;left:50%;background:#9de17c;transform: translateX(-50%);}
.course_c:before{content:'';display:block;width:23px;height:36px;position: absolute;top: 0;left:50%;background: url(../img/public/bg_c3.png)no-repeat;background-size:23px 36px;z-index: 99999;transform: translateX(-50%);}
.course_c ul li{width:100%;height:auto;zoom: 1;overflow:hidden;margin-top:20px;}
.course_c ul li h3{font-size: 24px;color: #444;padding:50px 30px 0;}
.course_c ul li span{color: #333333;font-size: 20px;padding:20px 30px;}
.course_c ul li div{width:480px;heihgt:298px;padding:10px;background: #cef0bd;position:relative;}
.course_c ul li img{width:100%;height:100%;}
.course_c ul li div:after{content:'';position:absolute;width:81px;height:31px;top:50px;z-index:999;}
.course_c ul li:nth-child(2n-1) div{float:left;}
.course_c ul li:nth-child(2n-1) div:after{right:-81px;background:url(../img/public/bg_c2.png) no-repeat;}
.course_c ul li:nth-child(2n-1) h3{float:right;width:50%;}
.course_c ul li:nth-child(2n-1) span{float:right;width:50%;}
.course_c ul li:nth-child(2n) div{float:right;}
.course_c ul li:nth-child(2n) div:after{left:-81px;background:url(../img/public/bg_c1.png) no-repeat;}
.course_c ul li:nth-child(2n) h3{float:left;text-align: right;width:50%;}
.course_c ul li:nth-child(2n) span{float:left;width:50%;text-align: right;}