Added more available weights for Roboto font.

assets/style/_defs.scss

@@ -31,6 +31,6 @@ $inverted-hover-link-color: #FFFFFF;
 
 @import url(https://fonts.googleapis.com/css?family=Open+Sans:300&subset=latin,greek);
 
-@import url(https://fonts.googleapis.com/css?family=Roboto:100);
+@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100;300;400&display=swap');
 
 @import url(https://fonts.googleapis.com/css?family=Work+Sans:100);