@media screen and (max-width:640px){


    #navi{
        display: none;
    }

    #footer{
        font-size: 10px;
    }

    .header_logo_in_title{
        font-size: 14px;
        width: auto;
        float: none;
        padding: 5px;
    }
    .header_logo_in_txt{
        width: auto;
        float: none;
        position: relative;
        top:0;
        font-size: 18px;
        padding: 5px;
    }
    .btn{
        font-size: 12px;
        width: 300px;
    }
    .btn_box{
        width: 100%;
    }
    .height_clear{
        height: auto;
    }

}