.header {
	position: absolute;
    z-index: 999999;
    width: 100%;
}
header {
  width: 1400px;
  height: 64px;
  margin: auto;
  align-items: center;
  color: #fff;
}
header .logo{
	float : left;
	padding-top: 10px;
}
header nav{
	float:right;
}
header nav > ul {
  display: flex;
  position: relative;
  margin-left: 200px;
}
header nav > ul li {
  width: 130px;
  text-align: center;
  height: 64px;
  line-height: 64px;
}
header nav ul a {
  display: block;
  font-size: 18px;
}
header nav ul ul a {
  display: block;
  font-size: 16px;
}
header nav > ul > li.on > a,
header nav > ul > li:hover > a {
  color: #4B89DC;
  transition: all 0.3s ease;
}

header nav ul.depth_2 {
  height: 0;
  position: absolute;
  z-index: 5;
  overflow: hidden;
  transition: all 0.5s ease;
  background-color:white;
  border-radius: 12px;
}
header nav ul.depth_2 li {
  height: 50px;
  line-height: 50px;
  margin-bottom:4px;
}
/*header nav ul.depth_2 li > a{
    display: block;
    border-radius: 12px;
    border: 2px solid #d2d2d2;
    box-sizing: border-box;
    min-height: 50px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
    padding: 0px;
    word-break: keep-all;
}*/
 
header nav ul li:hover > .depth_2 {
  height: auto;
}
header nav ul.depth_2 li:hover > a {
	display: block;
    border-radius: 12px;
	border: 2px solid #4B89DC;
    box-sizing: border-box;
    min-height: 50px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
    padding: 0px;
    word-break: keep-all;
}