diff --git a/quartz/styles/custom.scss b/quartz/styles/custom.scss
index 7cb58d44a..eb0abd7de 100644
--- a/quartz/styles/custom.scss
+++ b/quartz/styles/custom.scss
@@ -4,6 +4,11 @@ a[href^=http]:not([href*=pmcf\.xyz]):after {
   content: " ↗"
 }
 
+a.external {
+  text-decoration: none;
+  border-bottom: 1.3px dashed;
+}
+
 a.internal {
   border-radius: .1875rem;
   padding: 0 .3rem;