01. Structure
All you need to get started is a simple div with the class ‘neon’

02. Styling
For the style, we simply create a keyframe with the text shadow.
To give the effect of ‘turning off’ we just add in certain places in the keyframe the text-shadow: none

03. Final Result
See the Pen Neon Text Effect – Pure CSS3 – by MirkoDev.it by MirkoDev (@mirkodeveloper-the-bold) on CodePen.