diff --git a/theme.css b/theme.css
index 9e9e8dc..e2c4136 100644
--- a/theme.css
+++ b/theme.css
@@ -655,6 +655,21 @@ button.mod-cta:hover {
     background-color: var(--color-btn-primary-hover-bg);
 }
 
+/* Callout */
+body {
+    --callout-radius: 0;
+    --callout-border-width: 0;
+    --callout-padding: 0 1em;
+}
+.callout {
+    border-left: 0.25em solid var(--color-base-40);
+    background-color: transparent;
+    color: var(--text-muted);
+}
+.callout-content p {
+    margin: 0.1em 0;
+}
+
 /* Kanban */
 .kanban-plugin {
     background-color: var(--kanban-background);