FUNCTION TO ADD CUSTOM STYLE SHEET IN A PLUGIN
function msg_script_init() {
wp_enqueue_style("msgcs", plugins_url('user-messages/css/msgcss.css'), false, "0.0", "all");
}
add_action('admin_init', 'msg_script_init');
function msg_script_init() {
wp_enqueue_style("msgcs", plugins_url('user-messages/css/msgcss.css'), false, "0.0", "all");
}
add_action('admin_init', 'msg_script_init');