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views_pre_render add class item to a row

When pre-rendering a view row is there a way to add an HTML class into a single row of the markup, allowing me to add a new background colour to the event item highlighting its importance? This is for the calendar module monthly view

For example,

<div class="row"></div> <div class="row this-item-was-added-using-view-views_pre_render"></div> <div class="row"></div>

Below the is the what I have so far.

function pnc_views_overrides_views_pre_render(DrupalviewsViewExecutable $view) {       if ((int)Drupal::currentUser()->id() === 1) {         foreach ($view->result as $key => $value) {           try {             $field_result_value = $value->_entity->field_display->getValue();             if (isset($field_result_value[0]) && (int)$field_result_value[0]['value'] === 1) {               // add a class to the change the background color to hi-light its importance              }           } catch (Exception $e) {             Drupal::logger('viewoveride_pnc_cal_views_overrides')->error($e->getMessage());           }         }       } }
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views_pre_render add class item to a row

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