Change Search Box Size, Drupal

<?php
  if ($form_id == 'search_form') {
     $form['basic']['inline']['keys'] = array(
       '#type' => 'textfield',
       '#title' => '',
       '#default_value' => $keys,
       '#size' => 100, // Or whatever size you want
       '#maxlength' => 255,
    );
  }
?>