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

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

    .ser_h {
        font-size: 15px;
        line-height: 35px;
    }

    #box {
        margin-top: 10px;
    }
    #box:hover {
        margin-top: 10px;
    }
    .ser_sh{
        font-size:16px;
    }

    .navbar {
        padding-bottom: 12px;
    }

    .navbar-brand>img {
        height: 57px;
    }
    .navbar-brand{
        padding: 2px 0 !important;
    }
    .caption{
        padding: 30px 0px;
    }
    
}