.image_m,
    .image_mm,
    .image_mmm {
        width: 100%;
    }

    .image_mm,
    .image_mmm {
        display: none;
    }

    @media screen and (max-width:760px) {
        .image_m {
            display: none;
        }

        .image_mm {
            display: inline-block;
        }
    }

    @media screen and (max-width:360px) {
        .image_mm {
            display: none;
        }

        .image_mmm {
            display: inline-block;
        }
    }