match a category id in wordpress and then add styles just for that id

this is in template-parts/content.php which may be different based on your theme or version of wordpress. 

you can locate the category id in wordpress by going into categories and then clicking the category or mousing over it and viewing the TagID for the following example its 2

PHP

<?php
// content.php
$post_id = get_the_ID();
$category_array = get_the_category( $post_id );
$category_id = $category_array[0]->term_id;
?>

<?php if($category_id == 2) { ?>
<style>
.my-page-header {
	display:none;
}
</style>
<?php } ?>

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