diff --git a/r4ds.scss b/r4ds.scss
index ea7d950..b4fe1e8 100644
--- a/r4ds.scss
+++ b/r4ds.scss
@@ -38,6 +38,11 @@ code {
   color: #373a3c;
 }
 
+code a:any-link {
+  text-decoration: underline;
+  text-decoration-color: #ccc;
+}
+
 pre {
   background-image: linear-gradient(160deg,#f8f8f8 0,#f1f1f1 100%);
 }