add support for auto-sized big text via r-fit-text

dist/theme/simple.css

@@ -104,6 +104,15 @@ section.has-dark-background, section.has-dark-background h1, section.has-dark-ba
   margin: 20px 0;
   line-height: 1.3; }
 
+/* Remove trailing margins after titles */
+.reveal h1:last-child,
+.reveal h2:last-child,
+.reveal h3:last-child,
+.reveal h4:last-child,
+.reveal h5:last-child,
+.reveal h6:last-child {
+  margin-bottom: 0; }
+
 /* Ensure certain elements are never larger than the slide itself */
 .reveal img,
 .reveal video,