@media only screen and (max-width: 1000px) {
    header ul,
    header>div{
        display: none;
    }
    header{
        height: 90px;
    }
    .LOGO{
        height: 50px;
        top: 20px;
    }
    header>img{
        display: block;
    }
    .index-750-us{
        display: block;
    }
}