one-col.tpl.php

1. 9.x drupal/core/modules/layout/layouts/static/one-col/one-col.tpl.php
2. 9.x drupal/core/modules/layout/tests/layouts/static/one-col/one-col.tpl.php

<?php

/**
 * @file
 * Template for a 1 column layout.
 *
 * This template provides a simple one column display layout.
 *
 * Variables:
 * - $content: An array of content, each item in the array is keyed to one
 *   region of the layout. This layout supports only one section:
 *   - $content['content']: Content in the content column.
 */
?>
<div class="layout-display layout-one-col <?php

print $attributes['class'];
?>"<?php

print $attributes;
?>>
  <div class="layout-region">
    <?php

print $content['content'];
?>
  </div>
</div>