how to add bootstrap readmore button to teaser in drupal 8

Small snippet to add bootstrap button to teaser in drupal 8

In the theme file. Add this function:

/**
 * Implements template_preprocess_links()
 */
function THEME_NAME_preprocess_links(&$variables) {
  $variables['links']['node-readmore']['link']['#options']['attributes']['class'][] = 'btn btn-primary';
  $variables['links']['comment-add']['link']['#options']['attributes']['class'][] = 'btn btn-primary';
}

Then clear cache & refresh main page.

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