@media only screen and (max-width: 750px) {
    .cont-end{
        margin-top: 650px;
    }
}
@media only screen and (max-width: 750px) {
    .marker{
        margin-top: 50px;
    }
}
@media only screen and (max-width: 750px) {
    .our-gallery{
      width: 100%;
    }
}