Hi,
1- Open this CSS file:
/plugins/system/flexibleZoomEffect/media/css/flexibleZoomEffect.css
2- Scroll to the very bottom and insert these lines:
ul#FlexibleAdditionalGallery li a.active,
ul#FlexibleAdditionalGallery li a:hover {
background:none;
border-color: transparent
}
and the borders will be gone.
To change the color, (i.e: silver), simply insert these lines instead
ul#FlexibleAdditionalGallery li a.active,
ul#FlexibleAdditionalGallery li a:hover {
background: #ccc;
border-color: #ccc;
}
Regards.