.blockImg {
        height: 0;
        overflow: hidden;
        background-size: cover;
        background-position: top 50%;
    }
    
    .block-1 {
        padding-top: 41.78%;
        background-image: url("../img/textHeadPC-Present.gif");
    }

    .block-2 {
        padding-top: 51.789%;
        background-image: url("../img/bloc2PC-Present.gif");
    }

    .block-3 {
        padding-top: 65.63%;
        background-image: url("../img/block3Presen.gif");
    }

    .block-4 {
        padding-top: 59.21%;
        background-image: url("../img/blockbotPCPresen.gif");
    }


    @media (max-width:1200px) {
        .block-1 {
            padding-top: 68.9%;
            background-image: url("../img/textHeadPC-Present-1200.gif");
        }

        .block-2 {
            padding-top: 81.83%;
            background-image: url("../img/block2Presen-1200.gif");
        }

        .block-3 {
            padding-top: 103.9%;
            background-image: url("../img/block3Presen-1200.gif");
        }

        .block-4 {
            padding-top: 93.75%;
            background-image: url("../img/blockBot-1200Presen.gif");
        }
    }