function.php

add_filter('body_class','er_logged_in_filter');
function er_logged_in_filter($classes) {
if( is_user_logged_in() ) {
		$classes[] = 'loggedin-class';
	} else {
		$classes[] = 'loggedout-class';
		}
	return $classes;
}

style.css

.loggedout-class.post-284267 .entry-content {
    padding: 0.75rem 1.25rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
    color: #004085;
    background-color: #cce5ff;
    border-color: #b8daff;
}


.loggedout-class.page-id-288728 .entry-content {
    padding: 0.75rem 1.25rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
    color: #004085;
    background-color: #cce5ff;
    border-color: #b8daff;
}