Thank you very much for your help!
the lightbox looks much better now.
www.bewoners-stadseiland.nl/monitoring-bloemrijke-bermen/
This the code I use.
/* styling caption */
.fancybox-caption {text-align: center; font-size: 40px; font-weight: 500; color: currentcolor; }
/* padding around image */
.fancybox-image {padding: 20px;}
/* styling lightbox */
.fancybox-container {
top: 10%;
left: 20%;
width: 60%;
height: 80%;
border: 0px solid #73AD21;
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
/* remove white line */
body .fancybox-caption {border-top-style:none}
/* remove gray background */
body .fancybox-caption-wrap {background:none}
More one question:
How can add a margin around the buttons in the upper right corner?
Thank you!
Otto