I was able to replicate this in studio using a SurfaceGui with the LightInfluence set to 0 and an ImageLabel using a custom image for the glow on the part.
Around the glass part I used three other neon parts with the size of 0.05. Then I threw a PointLight inside of the glass part for fun.
Here’s a model for those that would like to take a look at it: Sign with Glowing Edges - Roblox