UPDATE: 19 June 2018
A couple of comments have indicated that certain style changes were not taking effect. This generally happens because the selector is not specific enough. Without going into a lot of detail, there is one way to overcome this and although it is sometimes frowned upon by the CSS “purists”, others live by the saying – “if all else fails, try !important 🙂
Note in the updated CSS below where and how !important is used.
Until Elementor comes up with global settings for various elements such as buttons and the like, this is relatively easy to implement to have all your Elementor buttons be styled in the same way.
The Simple CSS plugin is used to enter the CSS.
CSS for this tutorial below the video.