@media only screen and (max-width: 450px) {

    .img_large {
        width: 100%;
        margin-right: 5px;
        margin-bottom: 5px;
    }
}

@media only screen and (max-width: 300px) {

    .img_large2 {
        width: 100%;
        margin-right: 5px;
        margin-bottom: 5px;
    }
}