Add placeholder, icon
function register_form_search_block_form_alter(&$form, &$form_state, $form_id) {
if ($form['#id'] == 'search-block-form--2') {
$form['keys']['#prefix']= '<div class="icon"><i class="fa fa-search" aria-hidden="true"></i>';
$form['keys']['#attributes']['placeholder'] = t('Search for Topics');
unset($form['actions']['submit']);
$form['keys']['#sufix']= '</div>';
}
}
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