#image_gallery_container img {
    height: 300px;
    -webkit-filter: sepia(100%);
    filter: sepia(100%);
    transition-duration: 1s;
}

    #image_gallery_container img:hover {
        -webkit-transform: scale(1.1);
        -ms-transform: scale(1.1);
        transform: scale(1.1);
        -webkit-filter: none;
        filter: none;
    }