diff --git a/lib/assets/stylesheets/modules/_contribution-banner.scss b/lib/assets/stylesheets/modules/_contribution-banner.scss
index 6de7249a..7f368a94 100644
--- a/lib/assets/stylesheets/modules/_contribution-banner.scss
+++ b/lib/assets/stylesheets/modules/_contribution-banner.scss
@@ -1,4 +1,5 @@
 .contribution-banner {
+  @include govuk-font($size: 19);
   padding: 0;
   max-width: 40em;
   margin-top: govuk-spacing(9);