The Header H2 Search results title doesn't have any class for theming

Problem/Motivation

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet

The docroot/core/modules/search/src/Controller/SearchController.php Line 102 , should have any class for

to get selected by css
if (count($results)) {
$build['search_results_title'] = [
'#markup' => '

' . $this->t('Search results') . '

',
];
}