apply styling only to a specific url

Why don’t you add a class to body via functions if you are on that url, so you can use that class on css, like so:

function add_class_to_body($classes) {
    if(is_page('events')){
        $classes[] = 'page-events';
        return $classes;
    }
}
add_filter('body_class','add_class_to_body');

Then you are able to target through

.page-events div{
    background-color: red;
}