@media only screen and (max-width: 768px) {
    .location_h1 {
        font-size: 75px;
    }
    h1#courses_rek {
        font-size: 20px;
    }
    p#courses_rek_p {
        font-size: 10px !important;
    }
    .carousel {
        background-color: #eeeeee;
        min-height: 55vh;
        padding: 0;
    }
    .staff {
        display: none;
    }
    .carousel-inner {
        min-height: 40vh;
    }
    .carousel img {
        max-width: 45vw;
        height: 75vw;
    }

    .most-inner {
        max-width: 70vw;
    }
    .profile-card {
        margin: 10px 50px;
    }
    .font_size {
        font-size: 2rem;
    }
    .about_us {
        font-size: 55px !important;
    }
    .astrum_img {
        display: none;
        top: 160rem;
    }
    .section-fon {
        display: none;
        background-size: 100% 340px;
    }
    .img-fon {
        display: none;
    }
    .back p.text-white {
        font-size: 10px;
    }
    .back {
        height: 25%;
        border-radius: 0px;
        -webkit-border-radius: 0px;
        -moz-border-radius: 0px;
        -ms-border-radius: 0px;
        -o-border-radius: 0px;
    }
    .back div {
        text-align: end;
    }
    .back a {
        margin-top: 0px !important;
        font-size: 12px;
        padding: 10px !important;
    }
    .carusel-top {
        min-height: 65vh;
    }
    h1#courses_rek {
        font-size: 22px;
    }
    p#courses_rek_p {
        font-size: 10px !important;
        padding: 0px !important;
    }

    h1.font_size {
        font-size: 2.1rem;
    }
    h1.text-center .text-white {
        font-size: 40px;
    }
    .card_table {
        display: block;
    }
    .card_table img {
        display: none;
    }
    p#skill {
        width: 100%;
    }
    nav#navbar-bg {
        width: 100%;
    }
    p.bg-warning {
        width: 100%;
    }
}
@media only screen and (min-width: 768px) {
    .back {
        height: 30%;
    }
    .astrum_img {
        top: 160rem;
    }
    #navbar-bg {
        margin: auto;
    }
}

@media only screen and (min-width: 1280px) {
    .nav-item #btn {
        display: none;
    }
    .back {
        height: 65%;
    }
}

@media only screen and (max-width: 1279px) {
    .nav-item a {
        font-size: 14px;
    }
    .nav-item .dropdown button {
        font-size: 14px;
    }
    h1#courses_rek {
        font-size: 35px;
    }
    h1.text-center .text-white {
        font-size: 60px;
    }
}
@media only screen and (max-width: 1200px) {
    .nav-item a {
        font-size: 15px;
    }
    .nav-item .dropdown button {
        font-size: 11px;
    }
    h1 {
        font-size: 20px !important;
    }
    p {
        font-size: 16px !important;
    }
    h1.font_size {
        font-size: 3rem;
    }
    .back h1.text-white {
        display: none;
        font-size: 18px;
        width: 80%;
    }
    .back p.text-white {
        display: none;
        font-size: 10px !important;
        width: 70%;
        padding: 0px !important;
    }
}
@media only screen and (min-width: 992px) {
    .astrum_img {
        top: 125rem;
    }
    .back {
        height: 50%;
    }
    .section-fon {
        height: 45%;
    }
    .carousel-caption h1 {
        width: 75%;
    }
}

@media only screen and (max-width: 992px) {
    p#courses_rek_p {
        font-size: 12px !important;
        padding: 0px !important;
    }
    h1.font_size {
        font-size: 2.7rem;
    }
    .carousel-caption h1 {
        width: 75%;
    }
}