.header {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 60px;
  min-width: 1200px;
  background: #3399ff;
  box-sizing: border-box;
}
.header_left img {
  width: auto;
  height: 58px;
}
.header_right {
  display: flex;
}
.header_nav {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 109px;
  height: 60px;
  text-align: center;
  font-size: 16px;
  position: relative;
  color: rgb(224, 230, 232);
  cursor: pointer;
}
.header_nav .header_subnav_box {
  width: 100%;
  position: absolute;
  top: 60px;
  background: rgba(56, 56, 56, 0.7);
  display: none;
  z-index: 2;
}
.header_nav .header_subnav_box .header_subnav {
  padding: 10px 0;
}
.header_nav .header_subnav_box .header_subnav .header_subnav_a {
  color: rgb(224, 230, 232);
  font-size: 16px;
}
.header_nav:hover .header_subnav_box {
  display: block;
}
.header_nav .header_subnav_box .header_subnav:hover {
  background-color: rgb(163, 163, 163);
}