.ow_header_pic{background-image:url(https://puzzles.zonavirtuala.net/ow_userfiles/themes/theme_image_2.jpg)}
.ow_logo{background-image:url(https://puzzles.zonavirtuala.net/ow_userfiles/themes/theme_image_3.png)}
.ow_footer div a img[src*="powered-by-oxwall.png"] {
    opacity: 0;
    transition: all ease 0.5s;
    -webkit-transition: all ease 0.5s;
    -moz-transition: all ease 0.5s;
    -o-transition: all ease 0.5s;
}
.ow_footer div a img[src*="powered-by-oxwall.png"]:hover {
    opacity: 1;