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


    #navi{
        display: none;
    }

    #footer{
        font-size: 10px;
    }
    .header_logo img{
        width: 75px;
    }
    .header_logo_in_txt{
        font-size: 13px;
        position: relative;
        top: 50px;
    }
    .header_logo_in_txt span{
        font-size: 40%;
    }
    .btn{
        font-size: 12px;
        width: 300px;
    }
    .btn_box{
        width: 100%;
    }
    .height_clear{
        height: auto;
    }
    .mini_btn2{
        width: 99%;
        height: 120px;
        font-size:14px;
        margin-top: 5px;
        margin-bottom: 5px;
    }
}