.ct_img {
    height: 700px;
    margin: 100px 100px;
    padding: 0px;
    border-radius: 10px;
}

@media screen and (max-width: 1200px) {
    .ct_img {
        height: 400px;
        margin: 0px;
        padding: 0px;
    }
  }
@media screen and (max-width: 768px) {
    .ct_img {
        height: 300px;
        margin: 0px;
        padding: 0px;
    }
  }