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jQuery Mobile Element Sizes
// For all buttons use something like this
$('.ui-btn').css('width','50%');

// For individual buttons use something like this
$('#theButton1').parent().css('width', '75%');

// Or this for HREF data-role buttons
$('#hrefButton4').css('width', '45%');

// this changes the height for all buttons
$('.ui-btn-text').css('font-size','50px');

// This changes the height for a single element
$('#hrefButton3').children().children().css('font-size','30px');

<div data-role="page" id="home">
    <div data-role="content">
        <input type="button" id="theButton1" value="Press Me 1" />
        <input type="button" id="theButton2" value="Press Me 2" />
        <input type="button" id="theButton3" value="Press Me 3" />
        <input type="button" id="theButton4" value="Press Me 4" />
        <br />
        <a href="#" data-role="button" id="hrefButton1">HREF Me 1</a>
        <a href="#" data-role="button" id="hrefButton2">HREF Me 2</a>
        <a href="#" data-role="button" id="hrefButton3">HREF Me 3</a>
        <a href="#" data-role="button" id="hrefButton4">HREF Me 4</a>
    </div>
</div>