@media screen and (max-width:750px){
     .header_box{
        width:100%;
    }
    .header_logo a img{
        height: 50px;
        margin-left: 10px;
    }
    .search_w{
        width: 60%;
        margin-top: 14px;
    }
    .header_ipt{
        width: 45%;
        font-size: 12px;
    }
    .header_nav{
        overflow-y: scroll;
    }
    .header_nav ul{
        width: auto;
        display: flex;
        flex-wrap: nowrap
    }
    .header_nav ul li{
        flex-shrink: 0;
    }
}