One more thing. Adding a minimum width might be necessary, because I think that the table cell display will shrink everything as much as possible. So this might work better:
[code]
<div style=’display: table-cell; vertical-align: middle; min-width: 220px;’>
<?php echo do_shortcode(‘[wpdreams_ajaxsearchpro id=1]‘); ?>
</div>
[/code]