```html
<div class="bn-grid-bg"><!-- content --></div>
<style>
  .bn-grid-bg {
    background-color: var(--canvas);
    background-image: radial-gradient(var(--ink) 1.5px, transparent 1.5px);
    background-size: 32px 32px;
    min-height: 160px; /* preview only — remove or override when used full-bleed */
  }
</style>
```
