Fix #5 replace text-side with font-size in css template

inst/resources/template.css

@@ -63,7 +63,7 @@ h1, h2, h3 {
 .remark-slide-number {
   color: {{text_slide_number_color}};
   opacity: 1;
-  text-size: {{text_slide_number_font_size}};
+  font-size: {{text_slide_number_font_size}};
 }
 {{ifelse(!is.na(text_bold_color), paste0("strong{color:", text_bold_color,";}"), "")}}
 a, a > code {