template.php

<?php

/**
 * Duplicate of theme_menu_local_tasks() but adds clearfix to tabs.
 */
function cleanish_menu_local_tasks(&$variables) {
  $output = '';

  if (!empty($variables['primary'])) {
    $variables['primary']['#prefix'] = '<h2 class="element-invisible">' . t('Primary tabs') . '</h2>';
    $variables['primary']['#prefix'] .= '<ul class="tabs primary clearfix">';
    $variables['primary']['#suffix'] = '</ul>';
    $output .= backdrop_render($variables['primary']);
  }
  if (!empty($variables['secondary'])) {
    $variables['secondary']['#prefix'] = '<h2 class="element-invisible">' . t('Secondary tabs') . '</h2>';
    $variables['secondary']['#prefix'] .= '<ul class="tabs secondary clearfix">';
    $variables['secondary']['#suffix'] = '</ul>';
    $output .= backdrop_render($variables['secondary']);
  }
  return $output;
}

/**
 * Override or insert variables into the node template.
 */
function cleanish_preprocess_node(&$variables) {
  $node = $variables['node'];
  if ($variables['view_mode'] == 'full' && node_is_page($variables['node'])) {
    $variables['classes_array'][] = 'node-full';
  }
}