@media only screen and (max-width: 1200px) {}

@media only screen and (max-width: 991px) {

    .logo{
        font-size: 32px;
    }
    .navbar .navbar-nav > li > a{
        padding: 12.5px 11px;
        font-size: 16px;
    }
    .banner_content{
        padding: 0 10%;
    }
    .h_a_h{
        font-size: 60px;
    }

}

@media only screen and (max-width: 767px) {

    .navbar-toggle {
        margin-top: 15px;
        margin-bottom: 15px;
    }
}

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

    .banner_content{
        padding: 0 5%;
    }
    .banner_h{
        font-size: 42px;
    }
    .h_a_h{
        font-size: 30px;
    }

}