.reveal .exhibit img {display:block; max-height:480px; max-width:100%; width:auto; height:auto; margin:0 auto; object-fit:contain;}
.reveal .exhibit p {margin:0;}
.reveal .source {font-size:16px; line-height:1.2; margin-top:8px;}
.reveal .references-slide {font-size:23px;}

/* Discussion exhibits share a slide with their visible discussion label. */
.reveal .discussion-exhibit img {max-height:460px; height:auto; object-fit:contain;}
.reveal .discussion-exhibit > p:first-of-type {font-size:0.8em; margin:0 0 0.3em;}