#header {
	border-bottom: none;
}
#content {
	padding-top: 0px;
}
.banner {
	position: relative;
}
.banner .category {
	position: absolute;
	z-index: 2;
	top: 25px;
	left: 27px;
	width: 235px;
	height: 486px;
	padding: 30px 0;
	background-color: white;
}
.banner .category .item:hover {
	background-color: #FFF1F1;
}
.banner .category .item .explicit {
	display: flex;
	align-items: center;
	justify-content: center;
	color: black;
	padding: 10px 35px;
}
.banner .category .item .explicit .image {
	width: 25px;
	height: 25px;
	margin-right: 25px;
	border-radius: 50%;
}
.banner .category .item .explicit .arrow {
	width: 7px;
	height: 14px;
	margin-left: auto;
}
.banner .category .item .content {
	position: absolute;
	top: 0;
	left: 100%;
	display: none;
	width: 477px;
	height: 486px;
	padding: 20px;
	background-color: white;
}
.banner .category .item:hover .content {
	display: block;
}
.banner .category .item .content .course {
	display: flex;
	margin-bottom: 15px;
}
.banner .category .item .content .cover {
	width: 120px;
	height: 90px;
}
.banner .category .item .content .info {
	flex: 1;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	width: 0;
	margin-left: 15px;
}
.banner .category .item .content .name {
	color: black;
	font-size: 16px;
	font-weight: bold;
}
.banner .category .item .content .description {
	color: #888888;
	font-size: 14px;
	line-height: 24px;
	overflow: hidden;
	text-overflow: ellipsis;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
}
.banner .category .item .content .more {
	display: block;
	width: 339px;
	height: 35px;
	color: #999999;
	font-size: 14px;
	line-height: 35px;
	text-align: center;
	margin: 0 auto;
	background-color: #F3F3F3;
}
.poster {
	margin: 40px 0;
	overflow: hidden;
}
.poster .item {
	display: block;
	float: left;
	width: 286.5px;
	height: 112px;
	margin-right: 18px;
	margin: 16px 18px 0 0;
}
.poster .item:nth-child(4n) {
	margin-right: 0;
}
.poster .item:nth-child(-n+4) {
	margin-top: 0;
}
.poster .item img {
	display: block;
	width: 100%;
	height: 100%;
}
.group-box .group:nth-child(2n) {
	padding: 50px 0;
	background-color: #F9F9F9;
}
.group-box .group:nth-child(3n-2) .course-item {
	display: block;
	width: 381px;
	margin: 60px 28px 0 0;
}
.group-box .group:nth-child(3n-2) .course-item:nth-child(3n) {
	margin-right: 0;
}
.group-box .group:nth-child(3n-2) .course-item:nth-child(-n+3) {
	margin-top: 0;
}
.group-box .group:nth-child(3n-2) .course-item .cover-box {
	position: relative;
}
.group-box .group:nth-child(3n-2) .course-item .cover {
	display: block;
	width: 100%;
	height: 286px;
}

.group-box .group:nth-child(3n) .course-item {
	display: flex;
	width: 561px;
	height: 160px;
	margin: 25px 68px 0 0;
}
.group-box .group:nth-child(3n) .course-item:nth-child(2n) {
	margin-right: 0;
}
.group-box .group:nth-child(3n) .course-item:nth-child(-n+2) {
	margin-top: 0;
}
.group-box .group:nth-child(3n) .course-item .cover {
	display: block;
	width: 212px;
	height: 100%;
	margin-right: 25px;
}
.group-box .group:nth-child(3n) .course-item .info {
	position: relative;
	flex: 1;
	width: 334px;
}
.group-box .group:nth-child(3n) .course-item .name {
	font-weight: bold;
	margin-top: 0;
}
.group-box .group:nth-child(3n) .course-item .bottom {
	align-items: flex-end;
	position: absolute;
	bottom: 0;
	width: 100%;
}