.navbar-default {
    background-color: #fff;
    border: none;
    box-shadow: 0px 2px 8px 0px rgba(50, 50, 50, 0.25);
    margin-bottom: 0;
}
#menu{
    margin-bottom: 0;
    background-color: #fff;
    border: none;
}
.navbar-default .navbar-nav > li > a, .navbar-right > a {
    font-size: 15px;
    font-weight: bold;
    color: #666;
    /*color: black;*/
    height: 60px;
    line-height: 35px;
}

.nav-container{
    display: flex;
    flex-direction: column;
}
.navbar-container{
    display: flex;
    justify-content: space-between;
}
.first-layer{
    display: flex;
    justify-content: space-between;
}
.header-wrap__left{
    float: left;
    display: inline;
}
.header-wrap__left div{
    display: inline;
}
.menu-container{
    width: 80%;
    padding-left: 110px;

}
.navbar-nav > li > a {
    padding-top: 10px;
    padding-bottom: 10px;
}
/*.menu-container .head-button{*/
/*    margin-left: 80px;*/
/*}*/
.header-wrap__left img{
    width: 15%;
    margin: 0 10px;
}
.header-wrap__left .af-logo{
    width: 8%;
}
.header-wrap__left{
    margin-top: 10px;
    padding-left: 140px;
}

.logo-container-seperator{
    font-size: 30px;
    color: lightgray;
    font-weight: lighter;
    margin: 0 5px;
}

.header-wrap__right .fact-header__poly-logo img{
    float: right;
    width: 170%; /* 图片宽度填充 div */
    height: auto; /* 根据图片比例调整高度 */
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu{
    width: 200px;
}
.dropdown-item{
    padding: 5px 10px;
    font-weight: bold;
    color: #666;
    line-height: 35px;
    display: block;
}

.arrow {
    display: inline-block;
    width: 0.5em;
    height: 0.5em;
    border-top: 0.15em solid darkgray;
    border-right: 0.15em solid darkgray;
    transform: rotate(135deg);
    margin-left: 0.3em;
    margin-bottom: 2px;
}