.nav {
	width: 900px;
	height: 40px;
	margin: 0 auto;
	padding: 0;
	display: flex;
	position: relative;
	z-index: 999;
	border-left: 1px solid #333;
}
.nav li {
	position: relative;
	list-style: none;
	display: block;
	width: 150px;
	height: 40px;
	text-align: center;
	color: #ffa500;
	font-size: 14px;
	font-weight: bold;
	line-height: 2.8;
	background: #4c4c4c;
	transition: 0.5s;
	text-decoration: none;
	border-right: 1px solid #333;
	box-sizing: border-box;
}
.nav li a {
	display: block;
	width: 150px;
	height: 40px;
	text-align: center;
	color: #fff;
	font-size: 14px;
	font-weight: bold;
	line-height: 2.8;
	background: #4c4c4c;
	transition: 0.5s;
	text-decoration: none;
	border-right: 1px solid #333;
	box-sizing: border-box;
}
.nav > li:hover > a {/*layer-1*/
	color: #fff;
	background: #e86475;
}
.nav > li li:hover > a {/*layer-2*/
	color: #333;
	background: #e86475;
}
.nav li ul {
	top: 40px;
	left: -40px;
	position: absolute;
}
.nav li ul li {
	overflow: hidden;
	height: 0;
	transition: 0.2s;
}
/* .nav li ul li a {
  border-top: 1px solid #333;
} */
.nav li:hover > ul > li {
	overflow: visible;
	height: 40px;
}
.nav li ul li ul {
	top: 0;
	left: 110px;
}
.nav li ul li ul:before {/*layer-2*/
	position: absolute;
	content: "";
	top: 15px;
	left: 30px;
	border: 5px solid transparent;
	border-left: 5px solid #fff;
}
.nav li ul li ul li:hover > a {/*layer-3*/
	color: #333;
	background: #e86475;
}
.nav li ul li ul.left {
	top: 0;
	left: -190px;
}
.nav li ul li ul.left:before,/*layer-2-left*/  .nav li ul li ul li ul.left:before {/*layer-3-left*/
	position: absolute;
	content: "";
	top: 15px;
	left: 190px;
	border: 5px solid transparent;
	border-right: 5px solid #fff;
}
.nav li ul li ul.left li:hover > a {/*layer-2-left*/
	color: pink;
	background: #e86475;
}
.nav li ul li ul li ul.left li:hover > a {/*layer-3-left*/
	color: purple;
	background: #e86475;
}
.content {
	width: 900px;
	height: 200px;
	background: #eee;
	margin: 0 auto;
	padding: 10px;
	text-align: left;
	box-sizing: border-box;
}