.navbar-header {
  overflow: hidden;
  height: 50px;
}
.navbar-nav a{
  transition: none;
}
.navbar-nav li{
  width:300px;
  text-align:center;
  }
.navbar-nav{
  width:100%;
  display:flex;
  justify-content:space-around;
  }
/* 小屏幕（平板，大于等于 768px） */
@media (min-width: 768px) {
  .navbar-fixed-top {
    top: 80px;
    border: 0;
  }

  .navbar-top {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1030;
    height: 80px;
    background: #fff;
  }

  .navbar-top .row > div {
    float: right;
    margin-right: 15px;
  }

  .navbar-top p span {
    font-size: 18px;
    font-weight: 900;
  }

  .navbar-brand {
    margin-left: 0 !important;
    padding: 15px 25px;
    font-size: 16px;
  }

  .navbar-nav li a {
    padding: 15px 40px;
  }
/* 中等屏幕（桌面显示器，大于等于 992px） */
@media (min-width: 992px) {
  .navbar-top .row > div {
    margin-left: 25px;
  }

  .navbar-top p span {
    font-size: 22px;
  }
}