.div {
			float: left;
			margin-left: 10px;
			margin-top: 20px;
			margin-bottom: 20px;
			background-color: white;
			border: solid deepskyblue 1px;
			/*background-color: aliceblue;
			box-shadow: 1px 1px 5px;*/
			border-radius: 3%;
			width: 320px;
		}
		/*引言部分*/
		.introduction {
			font-size: 20px;
			margin-left: 37px;
		}
		/*section属性*/
		.box-section {}
		/*章节属性*/
		
		.box-section details {
			display: block line-height: 20px;
			padding-left: 20px;
			padding-top: 10px;
			padding-bottom: 10px;
		}
		/*章节动效*/
		.box-section details:hover {
			transition: background-color .5s, border-color .1s;
			background-color: rgba(135, 206, 250, .3);
			border-radius: 3%;
			border-left: solid 4px dodgerblue;
		}
		.box-section details summary {
			font-size: 20px;
			padding: 0;
			outline: none;
		}
		/*details*/
		.box-section .box-details {
			padding-left: 0;
		}
	    .box-section .box-details summary::-webkit-details-marker {
			font-size: 0;
			outline: none;
		}
		.box-section details .box-details:hover{
			transition: background-color .5s, border-color .1s;
			background-color: rgba(135, 206, 250, .3);
			border-radius: 3%;
			border-left: 3px orange solid;
		}
		.box-section details .box-details a {
			outline: none;
		}
		.box-section details .box-details a:hover{
			transition: background-color .5s, border-color .1s;
			background-color: rgba(0, 0, 0, .2);
			border-radius: 3%;
			border-right: 3px orange solid;
			border-left: none;
		}
		/*summary*/
		.box-summary {
			
		}
		.box-summary a:hover {
			text-decoration: none;
			width: 180px;
			border-left: 0px orange solid;
			background-color: black;
			color: black;
		}
		/*列表*/
		
		.box-ul {
			padding-left: 20px;
		}
		
		.box-ul li {
			display: block;
			padding-top: 10px;
			list-style: none;
		}
		
		.box-ul li a {
			display: block;
			transition: background-color .5s!important;
			height: 30px;
			border-radius: 5%;
			font-size: 20px!important;
			line-height: 30px;
			text-decoration: none;
			color: black;
		}
		/*功能模块动效*/
		
		.box-ul li a:hover {
			text-decoration: none;
			width: 180px;
			border-left: 3px orange solid;
			background-color: rgba(0, 0, 0, .2);
			color: black;
		}
		
		iframe {
			margin-top: 20px;
			margin-bottom: 20px;
			margin-left: 100px;
			float: left!important;
			
		}
		.clear {
			clear:both;
		}