::-moz-selection {
	background: #338FFF;
	color: #fff;
}
::-webkit-selection {
	background: #338FFF;
	color: #fff;
}
::selection {
	background: #338FFF;
	color: #fff;
}
.clear::after{
	content: "";
	display: block;
	height: 0px;
	clear: both;
	visibility: hidden;
}
.response-img{
	display: block;
	max-width: 100%;
}
.text-overflow{
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}
body{
	width: 100%;
	max-width: 1920px;
	min-width: 1200px;
}
#knowledge{
	width: 100%;
	position: relative;
	background-color: #ccc;
	padding: 40px 0;
}
.bookBox{
	width: 1000px;
	height: 500px;
	position: relative;
	margin: 30px auto;
	-webkit-perspective-origin: 50% 60%;
	perspective-origin: 50% 60%;
	-webkit-perspective: 1500px;
	perspective: 1500px;
	background: url("images/2021/book/bookBg.png") no-repeat 0 0 ;
	background-size: 100% 100%;
}
.bookBox:hover .lastBtn{
	display: block;
}
.bookBox:hover .nextBtn{
	display: block;
}
.bookPage{
	position: absolute;
	width: 500px;
	height: 500px;
	top: 0;
	-webkit-transform-style: preserve-3d;
	-moz-transform-style: preserve-3d;
	-ms-transform-style: preserve-3d;
	-o-transform-style: preserve-3d;
	transform-style: preserve-3d;
	-webkit-transition: all linear 2s;
	-moz-transition: all linear 2s;
	-ms-transition: all linear 2s;
	-o-transition: all linear 2s;
	transition: all linear 2s;
	background: url("images/2021/book/bookLeft.png") no-repeat;
	background-size: 479.26px 483.33px;
	background-position: 20.74px 8.3px;
}
.bookPage img{
	position: absolute;
	top: 50px;
	left: 50px;
	display: inline-block;
	width: 400px;
}
.bookWord{
	position: absolute;
	top: 50px;
	left: 50px;
	display: inline-block;
	width: 360px;
	height: 360px;
	padding: 20px;
	font-size: 20px;
	line-height: 27px;
	backface-visibility: visible;
	background-color: #f0f0f0;word-break:break-all;
	-webkit-column-count: 2;
	-webkit-column-gap: 40px;
	-moz-column-count: 2;
	-moz-column-gap: 40px;
	-ms-column-count: 2;
	-ms-column-gap: 40px;
	column-count: 2;
	column-gap: 40px;
}
.bookWord h1{
	font-size: 16px;
	font-weight: 600;
	line-height: 40px;
	width: 350px;
	/* float: left; */
	display: block;
	text-align: center;
}
.frist{
	left: 0;
	z-index: 1;
}
.frist img{
	z-index: 1;
}
.last{
	right: 0;
	z-index: 1;
}
.last p{
	z-index: 1;
}
.runPage{
	right: 0;
	-webkit-transform-origin: 0 0;
	-moz-transform-origin: 0 0;
	-ms-transform-origin: 0 0;
	-o-transform-origin: 0 0;
	transform-origin: 0 0;
}
.runPage,
.bookPage:last-child
{
	background: url("images/2021/book/bookRight.png") no-repeat;
	background-size: 479.26px 483.33px;
	background-position: 0 8.3px;
}
.runClass{
	-webkit-transform: rotateY(-180deg);
	-moz-transform: rotateY(-180deg);
	-ms-transform: rotateY(-180deg);
	-o-transform: rotateY(-180deg);
	transform: rotateY(-180deg);
}
.lastBtn,
.nextBtn
{
	display: none;
	position: absolute;
	top: 200px;
	cursor: pointer;
	z-index: 999;
	font-size: 50px;
	line-height: 100px;
	color: #fff;
	text-decoration: none;
	background-color: rgba(0,0,0,.5);
}
.lastBtn{
	left: 0;
}
.nextBtn{
	right: 0;
}
.canvasBox{
	display: block;
	width: 158px;
	height: 158px;
}
.pageNumber{
	position: absolute;
	bottom: -40px;
	right: 0;
	font-size: 20px!important;
	line-height: 30px;
}
.bookWord p{
	line-height: 33px;
	/* height: 176px; */
	overflow: hidden;
	text-indent: 2em;
	width: 337px;
	font-size: 14px;
	/* overflow-x: hidden; */
	/* overflow-y: scroll; */
	float: left;
}
.contentss::-webkit-scrollbar {
	/*滚动条整体样式*/
	width : 5px;  /*高宽分别对应横竖滚动条的尺寸*/
	height: 1px;
}
.contentss::-webkit-scrollbar-thumb {
	/*滚动条里面小方块*/
	border-radius: 10px;
	box-shadow   : inset 0 0 5px rgba(0, 0, 0, 0.2);
	background   : #ededed;
}

.contentss {font-size: 14px;line-height:200%;padding: 10px 18px;width: 330px;float: left;/* text-align: center; */position: absolute;overflow-x: hidden;overflow-y: scroll;height: 270px;}
.contentss p {text-indent:2em;}
.contentss div{text-indent:2em; font-family: "Microsoft Yahei"; font-size:14px;}
.contentss p{text-indent:2em;line-height: 30px;font-family: "Microsoft Yahei";font-size: 13px;}
.contentss span{font-family: "Microsoft Yahei";}