@media screen and (max-width: 771px) {
    .block-image img {
        margin-left: auto;
        margin-right: auto;
    }
}

.block-image img {
    max-width: 100%;
    height: auto;
}

.block-image .mob-img
{
    display: none;
}

.block-image .desk-img
{
    display: block;
}

@media screen and (max-width: 576px) {

    .block-image .mob-img
    {
        display: block;
    }

    .block-image .desk-img
    {
        display: none;
    }

    .block-image{
        margin-bottom: 15px;
    }

}