/* 菜单 */
<style>html, body, div, ul, li, h1, h2, h3, h4, h5, h6, p, dl, dt, dd, ol,
	form, input, textarea, th, td, select {
	margin: 0;
	padding: 0
}

* {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box
}

html, body {
	min-height: 100%
}

body {
	font-family: Helvetica, Pingfang SC, Microsoft YaHei, STHeiti, Verdana,
		Arial, Tahoma, sans-serif;
	font-size: 14px;
	color: #333;
	background: #fff;
	position: relative
}

h1, h2, h3, h4, h5, h6 {
	font-weight: normal
}

ul, ol {
	list-style: none
}

img {
	border: none;
	vertical-align: middle
}

a {
	color: #666;
	text-decoration: none
}

a:visited {
	color: #666;
	text-decoration: none
}

a:hover {
	color: #666;
	text-decoration: none
}

a:active {
	color: #666;
	text-decoration: none
}

table {
	border-collapse: collapse;
	table-layout: fixed
}

input, textarea {
	outline: none;
	border: none
}

textarea {
	resize: none;
	overflow: auto
}

.clearfix {
	zoom: 1
}

.clearfix:after {
	content: ".";
	width: 0;
	height: 0;
	visibility: hidden;
	display: block;
	clear: both;
	overflow: hidden
}
/* 本案例CSS*/
header {
	position: relative;
	z-index: 9999;
	border-bottom: 2px solid #119f0f;
	height: 100px;
	box-sizing: border-box;
}

.wrap {
	width: 100%;
	margin: 0 auto;
	text-align:left;
}

#nav {
	display: flex;
	flex-direction: row;
 /* 	justify-content: center; */
	/* align-items: center;  */
		align-items: right; 
	flex-wrap: wrap;
	
}

.logo {
    margin: 35px;
	width: 18%;
	overflow: hidden;
}

.logo a {
	display: block;
}

.logo a img {
	max-width: 150px; 
}

ul.nav {
	padding-right: 5%; 
	display: inline-flex; 
	flex: 1;
	padding-left: 50px; 
    margin-right:auto;
 	float:right;
}

li.nav-item {
	
	
	flex: 1;
}

li.nav-item>a {
	display: block;
	text-align: center;
	line-height: 100px;
	font-size: 16px;
	position: relative;
	font-family:"思源黑体";
}

li.nav-item>a::before {
	display: none;
	content: '';
	position: absolute;
	 left: 50%; 
	bottom: 0;
	transform: translateX(-50%);
	border-width: 0 10px 10px;
	border-style: solid;
	border-color: transparent transparent #119f0f;
	position: absolute;
	
}

li.nav-item:hover>a, li.nav-item.active>a {
	color: #505DE6;
}

li.nav-item:hover>a::before, li.nav-item.active>a::before {
	display: block;
}
/* 二级菜单 */
.subMenu {
	display: none;
	position: absolute;
	top: 100px;
	left: 0;
	width: 100%;
	/* height: 100px; */
	background-color: #F4F6FC;
}

.subMenu>ul {
	display: flex;
	flex-wrap: wrap;
	flex-direction: row;
	/* justify-content: center; */
	align-items: left;
}

.subMenu>ul>li>a {
	display: block;
	padding: 0 18px;
	text-align: center;
	line-height: 40px;
	color: #242A33;
}

.subMenu>ul>li>a:hover {
	color: red
}
</style>