.hd_head a{
    display: inline-block;
   font-size: 18px;
   margin-left: 45px;
   padding: 20px 0;
   color: #505050;
}
.hd_head .chosed{
    color:#db0000;
    border-bottom: 2px solid #db0000;
}
.hd_head{
    width: 100%;
   margin: 0 auto;
   height: 73px;
   background: #fff;
   position: fixed;
   z-index: 10;
   left: 50%;
   transform: translateX(-50%);
   display: flex;
   justify-content: space-around;
}
.hd_head_img{
    width: 160px;
    margin-top: 6px;
}