diff --git a/lectures/revealjs/slides.css b/lectures/revealjs/slides.css
index 778fe744ea1be60585aece885d4530f0e1640fd0..3cb46372661cd1f31a6d7d6d2e87f27a12d57ddd 100644
--- a/lectures/revealjs/slides.css
+++ b/lectures/revealjs/slides.css
@@ -262,3 +262,8 @@ section h2 {
 /* body div.reveal {
 	margin-bottom: 40px !important;
 } */
+
+.line-through
+{
+	text-decoration:line-through
+}
\ No newline at end of file