practice2/css/media.css

@media all and (max-width: 1400px) {
    .slider {
        padding: 220px 0;
    }

    .text-img .head {
        font-size: 40px;
    }
}

@media all and (max-width: 1200px) {
    .slider {
        padding: 180px 0;
    }

    .common-h2 {
        font-size: 24px;
    }

    .chess-item p {
        position: relative;
        max-width: 320px;
        font-size: 20px;
    }

    .phone {
        font-size: 23px;
    }
}

@media all and (max-width: 1000px) {
    .text-img .head {
        font-size: 35px;
        width: 100%;
    }

    .row.top .chess-item {
        width: 49%;
        margin-top: 40px;
    }

    .row.top .chess-item:last-child {
        margin-left: 25%;
        text-align: center;
    }

    h1 {
        font-size: 25px;
    }

    .slider h2 {
        font-size: 20px;
    }

    .slider {
        padding: 120px 0;
    }

    .common-h2 {
        font-size: 22px;
    }

    .phone {
        font-size: 20px;
    }

    .border-btn {
        width: 150px;
        font-size: 14px;
    }

    nav ul li {
        font-size: 15px;
    }

    header .top-mnu .logo {
        max-width: 140px;
    }

    .advs .row.bottom .chess-item {
        width: 49%;
        transform: translateX(0%);
    }

    .advs .chess-item p.h2 {
        font-size: 24px;
    }

    .async .row.bottom,
    .async .row.top {
        text-align: center;
    }

    .async .text-img {
        margin-bottom: 0;
        padding: 20px;
        min-height: 400px;

    }

    .async .row.top img,
    .async .row.bottom img {
        opacity: 0.8;
        max-width: 65%;
    }

    .content.lh {
        line-height: 30px;
    }
}

@media all and (max-width: 800px) {
    .icons-item {
        width: 49%;
    }

    .async .text-img {
        margin: 50px auto;
    }

    .text-img .head {
        font-size: 30px;
    }

    .text-img {
        min-height: auto;
    }

    .text-img .head {
        width: 90%;
    }

    header .top-mnu .logo {
        max-width: 100px;
    }

    .border-btn {
        width: 140px;
        font-size: 11px;
        height: 35px;
        line-height: 34px;
    }

    .phone {
        font-size: 17px;
    }

    header .top-mnu {
        min-height: 100px;
        line-height: 100px;
    }

    .common-h2 {
        font-size: 18px;
        max-width: 80%;
    }

    .chess-item p {
        position: relative;
        max-width: 260px;
        font-size: 16px;
    }

    .chess-item p::before {
        width: 100px;
        height: 100px;
    }

    h1 {
        font-size: 23px;
    }

    .slider h2 {
        font-size: 18px;
    }

    .slider {
        padding: 100px 0;
    }

    .top-mnu .contacts {
        text-align: right;
        line-height: 30px;
    }

    header .top-mnu {
        line-height: 60px;
    }

    .three.nav {
        display: none;
    }

    .small-three {
        width: 49%;
    }

    .three.nav {
        display: none;
    }

    .row.bottom-9 .nine-item .img {
        transform: translateX(0%);
    }

    .row.top-9 .nine-item:nth-child(4),
    .row.top-9 .nine-item:nth-child(5) {
        transform: translateX(50%);
    }

    .row.bottom-9 .nine-item:last-child {
        margin-left: auto;
        margin-right: auto;
        display: block;
    }

    .sm {
        display: block !important;
        width: 100%;
        margin: 0 auto;
    }

    .chess-item p {
        padding-left: 20px;
    }

    .nine-item {
        text-align: center;
        display: inline-block;
        width: 32%;
        margin-top: 50px;
    }

    .content * {
        padding-top: 10px;
        font-size: 15px;
    }

    footer .left,
    footer .right {
        width: 100%;
    }

    footer .left .center:after {
        content: "";
        margin-top: 40px;
        margin-bottom: 20px;
    }

    .popup .title {
        margin-top: 55px;
        font-size: 16px;
    }

    .popup .nameText {
        font-size: 15px;
        margin-top: 20px;
    }

    .popup .close {
        font-size: 24x;
    }

    .popup .submit {
        font-size: 14px;
        height: 40px;
        line-height: 40px;
    }
}

@media all and (max-width: 550px) {
    .nine-p {
        font-size: 13px;
        margin-top: 15px;
    }

    .async .text-img {
        max-width: 90%;
    }

    .popup .title {
        margin-top: 55px;
        font-size: 16px;
    }

    .popup .nameText {
        font-size: 15px;
    }

    .popup .close {
        font-size: 24x;
    }

    .addr, .mail, .phone, .field {
        font-size: 13px;
    }

    .field {
        height: 40px;
    }

    .sign {
        font-size: 12px;
    }

    .num {
        font-size: 25px;
    }

    section {
        margin-top: 40px;
    }

    .advs .chess-item p {
        font-size: 15px;
    }

    .advs .chess-item p.h2 {
        font-size: 18px;
    }

    .advs .chess-item::before {
        font-size: 130px;
        line-height: 110px;
        left: 60px;
    }

    .async .text-img {
        width: 90%;
        margin: 20px auto;
    }

    .content {
        max-width: 100%;
        padding-left: 10px;
    }

    .content::after {
        display: none;
    }

    .text-img .head {
        font-size: 20px;
    }

    .content * {
        padding-top: 10px;
        font-size: 12px;
    }

    .chess-item {
        width: 100% !important;
        margin-top: 20px;
        margin-left: 0 !important;
    }

    .common-h2 {
        font-size: 15px;
    }

    .slider {
        padding: 70px 0;
    }

    h1 {
        font-size: 20px;
        line-height: 40px;
    }

    .slider h2 {
        font-size: 16px;
    }

    nav ul li {
        font-size: 13px;
    }

    .phone {
        font-size: 15px;
    }

    .border-btn {
        width: 110px;
        font-size: 10px;
        height: 30px;
        line-height: 30px;
    }

    section h1:after {
        width: 40px;
        right: -35%;
    }

    section h1.rev:after {
        left: -35%;
    }

    section h1 {
        font-size: 16px;
    }
}

@media all and (max-width: 480px) {
    .popup {
        height: 400px;
        max-width: 90%;
    }
}