diff --git a/packages/web/src/components/assets/com.standardnotes.theme-proton/index.css b/packages/web/src/components/assets/com.standardnotes.theme-proton/index.css
index 00ee3e4b4..088b86df0 100644
--- a/packages/web/src/components/assets/com.standardnotes.theme-proton/index.css
+++ b/packages/web/src/components/assets/com.standardnotes.theme-proton/index.css
@@ -70,6 +70,10 @@ a,
   outline-color: var(--primary);
 }
 
+#blocks-editor hr::after {
+  background-color: var(--border-norm);
+}
+
 [role='combobox'].border-passive-3 {
   border-color: var(--border-weak);
 }