@media only screen and (max-width: 950px) {
    #main_slider {
        top: 40%;
    }

    .slider_h {
        font-size: 35px;
    }

    .slider_p {
        font-size: 21px;
    }

    .slider_btn {
        padding: 8px 25px;
        font-size: 14px;
    }

    #logo {
        padding-top: 2%;
        width: 100px;
    }
}

@media only screen and (max-width: 768px) {
    .slider_h {
        font-size: 30px;
    }

    .navbar-brand {
        display: block;
    }

    .slider_p {
        font-size: 17px;
    }

    .slider_btn {
        padding: 7px 25px;
        font-size: 13px;
    }

    #main_slider {
        top: 30%;
    }
    #video_popup .modal-dialog{
        width: 90%;
        top: 15%;
        margin: auto;
    }
}

@media only screen and (max-width: 640px) {
    .slider_h {
        font-size: 25px;
        line-height: 35px;
    }

    .slider_p {
        font-size: 15px;
    }

    .slider_btn {
        padding: 5px 25px;
        font-size: 12px;
        margin-top: 10px !important;
    }

    #main_slider {
        top: 35%;
    }

    #logo {
        padding-top: 1.5%;
        width: 80px;
    }

    .resp-tab-item {
        font-size: 1em;
        padding: 5px 10px;
        margin: 7px 0em;
    }
}

@media only screen and (max-width: 450px) {
    .slider_h {
        font-size: 22px;
        line-height: 32px;
    }

    .slider_p {
        font-size: 14px;
    }

    .slider_btn {
        padding: 5px 25px;
        font-size: 11px;
        font-weight: 500;
        margin-top: 5px !important;
    }

    #main_slider {
        top: 25%;
        left: 0;
        right: 0;
        justify-content: center;
    }

    #logo {
        padding-top: 1.5%;
        width: 50px;
    }
}