<p>Using multiple column layouts isn't generally recommended on a mobile device because of the narrow screen width, but there are times where you may need to place small elements side-by-side (like buttons or navigation tabs, for example). The jQuery Mobile framework provides a simple way to build CSS-based columns through a block style class convention called <code>ui-grid</code>. </p>
<p>Grids have preset configurations for two- and three-column layouts that can be used in any situation that requires columns. Grids are 100% width, completely invisible (no borders or backgrounds) and don't have padding or margins, so they shouldn't interfere with the styles of elements placed inside them.</p>
<p>To build a two-column (50/50%) layout, start with a container with a <code>class</code> of <code>ui-grid-a</code> and add two child containers inside that are classed with <code>ui-block-a</code> for the first column and <code>ui-block-b</code> for the second:</p>
<p>The grid classes can be applied to any container. In this example, we've added <code>grid-a</code> to a <code>fieldset</code> to make the two button inside stretch to 50% of the screen width:</p>
<p>And, grid blocks can adopt presentation styles from the theming system — we've added a height and color swatch reference to the grid blocks.</p>
<p>There is a second grid for a 3 column layout (33/33/33%) that is similar in structure but uses <code>class=grid-b</code> on the parent and 3 child wrappers, each with <code>block-a/b/c</code> for the column child containers.</p>
