diff --git a/app/index.html b/app/index.html
index df1a053..3c1c3ad 100644
--- a/app/index.html
+++ b/app/index.html
@@ -797,7 +797,8 @@ body {
    TAG SYSTEM: CALLOUTS
    ═══════════════════════════════════════════ */
 .mdcms-callout {
-  border-left: 4px solid;
+  border-left: 4px solid var(--callout-primary, var(--accent));
+  background: var(--callout-bg, transparent);
   border-radius: 0 6px 6px 0;
   padding: 0.85rem 1rem 0.85rem 1rem;
   margin: 1.25rem 0;