You mean like I have on the live demo site? This is the code I used in a text widget:
Celestial is a professional WordPress theme that offers responsive design, flexible layouts, scalability, and gives you many customization options such as unlimited colours.
You also get a theme that is coded to WordPress standards which assures much better compatibility with plugins and of course, future updates of WordPress!
To hide the widget title, use a plugin “Remove Widget Title” and when you do your title on your widget, simply put a ! exclamation mark right in front of it. This works great for other things such as using a text widget for loading a static image or slider, or anything you don’t want the title of a widget to show.