Fixed font-weight inconsistency of strong text #389.

css/irma.css

@@ -19,6 +19,9 @@ html {
   scroll-behavior: smooth;
 }
 
+strong {
+  font-weight: 700;
+}
 
 @media screen and (prefers-reduced-motion: reduce) {
   html {
@@ -452,4 +455,4 @@ column.text p {
   .block-footer-2 img {
     max-width: 200px;
   }
-}
\ No newline at end of file
+}