@media only screen and (max-width: 768px) {

    header .container {
        display: none;
    }

    .topnav img {
        width: 200px;
    }

    .topnav {
        overflow: hidden;
        position: relative;
    }

    .topnav #myLinks {
        display: none;
        padding: 0 20px 20px 20px;
    border-bottom: solid 2px #000;
    }

    .topnav a {
        color: #000;
        padding: 14px 16px;
        text-decoration: none;
        font-size: 17px;
        display: block;
    }

    .topnav a.icon {
        background: black;
        display: block;
        position: absolute;
        right: 0;
        top: 0;
    }

    .topnav a.icon {
        color: #fff;
    }

    .topnav a:hover {
        background-color: #ddd;
        color: black;
    }

    .topnav a.active:hover {
        background-color: #fff;
    }

    .active {
        color: white;
    }

    .container {
        width: 580px;
        margin: 0 auto;
        padding-left: 10px;
        padding-right: 10px;
    }

    .button-block {
        display: grid;
        grid-template-columns: 1fr 1fr;
        justify-items: start;
        margin-top: 40px;
    }

    .right {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    #billboard .left {
        display: block;
    }

    #principles .container {
        text-align: center;
        color: #fff;
        display: grid    ;
        grid-template-columns: 580px;
        justify-content: center;
        padding: 30px 0 60px 0;
    }

    #faux-container .container {
        display: grid;
        grid-template-columns: 1fr;
        justify-items: center;
        position: relative;
        grid-row-gap: 40px;
    }

    #faux-container .container .box {
        padding: 20px;
        background-color: #fff;
        position: relative;
        top: -150px;
        width: 80%;
        margin: 0 auto;
        border-radius: 25px;
        border: solid 1px #7c7c7c;
    }

    #why {
        padding-top: 0;
    }

    #stats.parallax {
        height: 350px;
        padding: 60px 0;
        display: grid;
    }

    #stats .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    justify-items: center;
    text-align: center;
    }

    
    #stats .stat {
        display: grid;
        grid-template-columns: 1fr;
        align-items: center;
    }

    #featured-courses .container {
        width: 580px;
    }

    #courses {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-row-gap: 20px;
        grid-column-gap: 20px;
    }

    .cb-details button a {
        display: inline-block;
        width: 95%;
    }

    .details-bottom {
        display: grid;
        grid-template-columns: 1fr;
        justify-items: flex-start;
        align-items: center;
        grid-row-gap: 20px;
    }

    #lecturers {
        padding: 60px 10px 30px
    }

    #lecturers .container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-column-gap: 20px;
        grid-row-gap: 20px;
    }

    #testimonials.parallax {
        height: 420px;
    }

    #testimonials .container {
        display: grid;
        grid-template-columns: 550px;
        align-items: center;
        width: 580px;
        position: relative;
    }

    #testimonials .testimonial-box {
        width: 550px;
    }
    #faq-and-contact {
        padding-top: 480px;
    }

    #faq {
        margin-top: 60px;
    }

    #subscribe .container {
        display: grid;
        grid-template-columns: 1fr 2fr;
    }

    #subscribe img {
        max-width: 100%;
        height: 100%;
    }

    .subscribe-form input.submit-but {
        font-size: 12px;
        width: 100px;
    }

    footer {
        margin-top: 60px;
    }

    footer .container {
        display: block;
    }

    footer .container div {
        width: 90%;
        padding-left: 30px;
    }

    
    footer .links ul li, footer .categories ul li {
        background-position: left center;
    }

    footer .company {
        text-align: center;
    }

    /*****       *****/
    /**    PAGEs   **/
    /*****      *****/

    .about-page #billboard .container, 
    .our-courses-page #billboard .container, 
    .course-details-page #billboard .container {
        width: 600px;
    }

    .about-page .right, 
    .our-courses-page .right, 
    .course-details-page .right {
        grid-template-columns: 1fr 3fr;
        width: 600px;
    }

    #all-courses .container {
        text-align: center;
        padding-top: 30px;
        width: 580px;
    }

    .course-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-column-gap: 30px;
        margin-bottom: 30px;
        grid-row-gap: 30px;
    }

    #contact-div .container {
        display: grid;
        grid-template-columns: 1fr;
        grid-column-gap: 40px;
    }

    .contact-details {
        padding-top: 60px;
    }

}


@media only screen and (min-width: 768px) {
    .topnav {
        display: none;
    }

    .container {
        width: 1000px;
        margin: 0 auto;
    }

    header .container {
        display: grid;
        grid-template-columns: 1fr 4fr 1fr;
        justify-items: center;
        padding-top: 30px;
        max-width: 1200px;
    }

    header #logo img {
        max-width: 250px;
    }

    .button-block {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr 1fr;
        justify-items: start;
        margin-top: 40px;
    }

    .right, .left {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    #principles .container {
        grid-template-columns: 800px;
        padding: 30px 0 60px 0;
    }

    #faux-container .container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        justify-items: center;
        position: relative;
    }

    #faux-container .container .box {
        padding: 40px 40px 30px 40px;
        background-color: #fff;
        position: absolute;
        top: -150px;
        width: 40%;
        border-radius: 25px;
        border: solid 1px #7c7c7c;
    }

    #why {
        padding-top: 200px;
        padding-bottom: 60px;
    }

    #stats.parallax {
        height: 250px;
        padding: 60px 0;
        display: grid;
    }

    #stats .container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    justify-items: center;
    text-align: center;
    }

    
    #stats .stat {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: center;
    }

    #featured-courses .container {
        text-align: center;
        padding-top: 30px;
        width: 1200px;
    }

    #courses {
        display: grid;
        grid-template-columns: 380px 380px 380px;
        grid-column-gap: 30px;
    }


    .details-bottom {
        display: grid;
        grid-template-columns: 265px 105px;
        align-items: center;
    }

    .cb-details .details-bottom {
        justify-self: end;
        text-align: center;
    }

    .cb-details button a {
        display: inline-block;
        width: 100%;
    }

    #lecturers {
        padding: 30px;
    }

    #lecturers .container {
        display: grid;
        grid-template-columns: 300px 280px 280px 280px;
        grid-column-gap: 20px;
    }

    #testimonials .container {
        display: grid;
        grid-template-columns: 650px 400px;
        align-items: center;
        width: 1100px;
        position: relative;
    }

    #testimonials .testimonial-box {
        position: absolute;
        width: 400px;
    }

    #faq-and-contact .container {
        display: grid;
        grid-template-columns: 390px 590px;
        grid-column-gap: 20px;
        justify-content: center;
    }

    #faq-and-contact {
        padding-top: 230px;
        padding-bottom: 60px;
    }

    #subscribe .container {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    #subscribe img {
        max-width: 100%;
        border-radius: 25px;
    }

    .subscribe-form input.submit-but {
        font-size: 16px;
        width: 200px;
    }

    footer .container {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr 1fr;
        padding: 60px 0 0 0;
        font-size: 14px;
        justify-items: center;
    }

    /*****       *****/
    /**    PAGEs   **/
    /*****      *****/

    .about-page #billboard .container,
    .our-courses-page #billboard .container,
    .course-details-page #billboard .container {
        width: 1200px;
    }

    .about-page .right,
    .our-courses-page .right,
    .course-details-page .right {
        grid-template-columns: 1fr 2fr;
        width: 1000px;
        margin: 0 auto;
        padding-bottom: 60px;
    }

    #all-courses .container {
        text-align: center;
        padding-top: 30px;
        width: 1200px;
    }

    .course-row {
        display: grid;
        grid-template-columns: 380px 380px 380px;
        grid-column-gap: 30px;
        margin-bottom: 30px;
        grid-row-gap: 30px;
    }

    #contact-div .container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-column-gap: 40px;
    }

}