Import CSS stylesheet only for specific content type?
You can add your css only on Blog node pages so it does not impact site wide. Sample code

function MYTHEME_preprocess_node($vars) {
  if ($vars['#node']-&gt;type == 'blog') {
    drupal_add_css(drupal_get_path('module', 'mymodulename') . "/css/materializeCSS.css");
  }
}