Initial version

themes/zen/assets/sass/components/divider/_divider.scss

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+// Divider
+//
+// Can be used as an `<hr>`, an empty `<div>` or as a container.
+
+.divider,
+%divider {
+  // Add vertical rhythm margins.
+  @include margin-block(1);
+  border: 0;
+  border-top: 1px solid var(--color-border);
+
+  // If used as a container, add a top margin to the first child.
+  > :first-child {
+    @include margin-top(1);
+  }
+}