`<tbody/>` is automatically inserted, so we can guarantee that this affects all ths and tds in the last row of the table *body* and the head is left untouched
@@ -199,8 +199,9 @@ body {
border-bottom: 1px solid;
}
-.reveal table tr:last-child td {
- border-bottom: none;
+.reveal table tbody tr:last-child th,
+.reveal table tbody tr:last-child td {
+ border-bottom: none;
.reveal sup {