```html
<ui-grid class="demo-grid">
  <ui-grid-cell class="demo-cell" columns="6">6</ui-grid-cell>
  <ui-grid-cell class="demo-cell" columns="4">4</ui-grid-cell>
  <ui-grid-cell class="demo-cell" columns="2">2</ui-grid-cell>
</ui-grid>
```
