.pkp_site_name .is_img img {
    display: block;
    max-height: 300px;
    max-width: 100%;
    width: auto;
    height: auto;
}

.pkp_page_index .homepage_image img {
   float: right;
    width: 20%;
    margin-right: 150px;
    margin-top: 80px;
}