WordPress - Snippet - Remove draft preview

main.php

if (is_admin()) {
  function remove_draft_preview () {
?>
<style>
	#minor-publishing-actions {
		padding-top: 0;
	}
	#save-action #save-post, #save-action .spinner {
		margin-top: 10px;
	}
	#post-preview {
		display: none;
	}
</style>
<?php
  }
	
  add_action('admin_head', 'remove_draft_preview');
}