Shifted RevealJS fonts to Helvetica etc.

.revealjs/ntn.css

@@ -1,6 +1,5 @@
 /**
  * Black theme for reveal.js. This is the opposite of the 'white' theme.
- *
  * By Hakim El Hattab, http://hakim.se, edited by Nathan Schneider, ntnsndr.in
  * Needs to be placed in ~/.revealjs/reveal.js/dist/theme/
  */
@@ -16,7 +15,7 @@ body {
 }
   
 .reveal {
-  font-family: Helvetica, sans-serif; /* ntnsndr adjusted */
+  font-family: "Nimbus Sans", Helvetica, sans-serif; /* ntnsndr adjusted */
   font-size: 30px;
   font-weight: normal;
   color: black; }
@@ -52,7 +51,7 @@ body {
   margin: 0px auto 30px auto;
   background-color: light-gray; /* ntnsndr addition */
   color: black;
-  font-family: Helvetica, sans-serif; /* ntnsndr adjusted */
+  font-family: "Nimbus Sans", Helvetica, sans-serif; /* ntnsndr adjusted */
   font-weight: 600;
   line-height: 1.2;
   letter-spacing: normal;