WP Notification Bars is a free WordPress plugin that allows you to add lightweight, responsive notification bars to your website pages, with unlimited colors, custom code, calls to action and fixed/floating support, so you have complete control over how they display.
You can select basic setting like close button type and CSS position of the bar and you can also change the appearance of the notification bar.If you want you can also choose where to display the notification bar like homepage, single posts or pages.