.study_box{
	width: 800px;
	height:680px;
	overflow: hidden;
	padding:0px 200px 0 200px;
	background: url('/img/JCZS_bg.png') no-repeat center;
	background-size: auto  100%;
	margin:auto;
}
.tart_top{
    font-size: 38px;
    font-family: "KaiTi";
    color: #E81616;
    margin: 10px auto;
    width: 230px;
    height: 120px;
    line-height: 120px;
    background: url(/img/biaobg_png1.png) no-repeat center center;
    background-size: 100% 100%;
    letter-spacing: 5px;
  	text-align: center;
}
.content4_box{
	width: 800px;
	margin: 45px auto 0;
	overflow: hidden;
}
.content4_box li{
	float: left;
	width: 134px;
	height: 134px;
	line-height: 134px;
	text-align: center;
	
	font-weight: 700;
	background: url('/img/font4_bg.png') no-repeat;
	background-size: 100% 100%;
}
.content4_box li a{
	color: #000000;
	font-size: 78px;
}
.content4_box li{
    margin: 0 43px 0;
}
.content4_box li:nth-child(1){
	margin-left: 0;
}
.content4_box li:nth-child(4){
	margin-right: 0;
}

/*返回*/
.tom{
	width: 100%;
	margin:10px auto;
}
.fanhui{
	width: 150px;
	height: 52px;
	line-height: 52px;
	display: block;
	background: url('/img/butn_imgbg.png') no-repeat center;
	background-size: 100% 100%;
	font-size: 30px;
	color: #FFFFFF;
	float: right;
	text-align: center;
}


/*基础知识4*/
.content5_box{
	overflow: hidden;
	width: 666px;
	/*height: 152px;*/
	margin: 40px auto 0;
}
.content5_box li{
	width: 160px;
	height: 152px;
	line-height: 152px;
	text-align: center;
	
	font-weight: 700;
	background: url('/img/font5_bg.png') no-repeat center;
	background-size: 100% auto;
	float: left;
	margin: 0 6.9%;
}
.content5_box li a{
	color: #000000;
	font-size: 52px;
}
.content5_box li:nth-child(1){
	margin-left: 0;
}
.content5_box li:nth-child(3){
	margin-right: 0;
}
#li1{
	margin-left: 105px;
}


/*间架结构*/
.content6_wrap{
	width: 626px;
	height:400px;
	margin:0 auto;
	overflow: hidden;
}
.content6_box{
	width: 103%;
	height:100%;
	overflow-y: auto;
}
.content6_box li{
	width: 262px;
	height: 96px;
	line-height: 96px;
	text-align: center;
	float: left;
	background: url('/img/kkkas.png') no-repeat;
	background-size: 96% 100%;
	margin:50px 10px 50px 10px;
}
.content6_box li:nth-child(2n){
	float: right;
}
.content6_box li a{
	font-size: 44px;
	font-weight: 700;
	color: #000000;
}