I have a custom 404 error page, and I just want a quick module that hides the 404 page title, if the user arrives at a 404 error. 

I've found a D7 function that looks like it would work, checking for '404 Not Found' in the http header, and adding a class that I can target with CSS. But I'm not sure how I'd do something like this for D8.

Here's what I've got: 

    function MYMODULE_preprocess_html(&$variables) {
      $headers = drupal_get_http_header();
    
      if (isset($headers['status']) && $headers['status'] == '404 Not Found') {
        $variables['classes_array'][] = 'page-404';
      }
    }