Highlight list row on hover

A little QOL feature to help spotting a row in a long list such as Sites > Security > Sucuri, by discreetly highlighting the row background:

add_action('admin_head', 'backend_custom_css'); 
function backend_custom_css() { 
	echo '<style> 
		#mainwp-sucuri-sites-table [class="mainwp-sucuri-row"]:hover td {  	
			background-color: #f7f7f7; 
		} 
	</style>'; 
}