Hi Brigitte,
I am very sorry about the late response, there is still a bit of a mess on our servers due to the data loss issues in the previous month.
I have managed to log-in to the back-end.
I checked the individual items, but there is no featured image set unfortunately, nor any images within the contents, and it only contains an image gallery via a shortcode. The plugin can parse through the direct HTML contents, as well as executes shortcodes before checking the output for images, but I guess the gallery shortcode does not work like that – it probably only prints the images within the posts loop (when displayed), and not within the ajax context. I am not sure if that is possible to resolve, as it depends on the gallery shortcode as well.
To change the color, just enter the color code to the custom CSS:
a.chosen-single {
background: #d3f7f7 !important;
border: none !important;
}This one might change all the line backgrounds as well:
ul.chosen-results li {
background: #d3f7f7 !important;
}If you want, I can check on the image issue via directly debugging the code, but I will need FTP or SFTP details for it to do safely. I can check if there is anything I can do about it via a custom code.