html,
body {
	background-color: #fff;
}

.banner-box {
	width: 100%;
	height: 460px;
	background-image: url("../image/aboutus/banner.jpg");
	background-repeat: no-repeat;
	background-size: cover;
	background-position: center center;
}

.banner-box h1 {
	font-size: 88px;
	font-family: PingFang SC;
	font-weight: 800;
	color: #FFFFFF;
	text-shadow: 0px 5px 3px rgba(0, 30, 92, 0.34);
	text-align: center;
	line-height: 460px;
}

.nav-box {
	width: 100%;
	height: 98px;
	/* background: #F3F3F3; */
	background: #FFF;
	box-shadow: 0px 2px 4px 1px rgba(0, 0, 0, 0.12);
	position: relative;
	z-index: 99;
}

.nav-main {
	width: 1200px;
	height: 100%;
	margin: 0 auto;
	display: flex;
	justify-content: space-between;
	font-size: 20px;
	line-height: 98px;
	color: #666666;
}

.nav-main b {
	font-weight: bold;
	color: #333;
	font-size: 20px;
}

.nav-list {
	height: 100%;
	display: flex;
}

.nav-list li {
	margin-left: 60px;
	cursor: pointer;
}

.nav-list li.active {
	font-weight: bold;
	color: #0071E3;
	border-bottom: 3px solid #0071E3;
}

.item-title {
	width: 100%;
	text-align: center;
	margin-bottom: 50px;
}

.item-title h2 {
	font-size: 28px;
	font-family: PingFang SC;
	font-weight: bold;
	color: #333333;
	line-height: 50px;
	margin-bottom: 14px;
}

.title-bottom {
	width: 0px;
	height: 0px;
	border: 14px solid #000;
	border-top-color: #000;
	border-bottom-color: transparent;
	border-left-color: transparent;
	border-right-color: transparent;
	margin: 0 auto;
}
.item-white h2{
	color: #fff;
}
.item-white .title-bottom{
	border-top-color: #FFF;
}

.item-box{
	width: 100%;
	height: auto;
	padding: 50px 0;
}
.item-main{
	width: 1200px;
	height: auto;
	margin: 0 auto;
	box-shadow: 0px 0px 18px 0px rgba(0,0,0,0.3);
	border-radius: 20px;
}