how do i make this glow effect?

https://preview.redd.it/x7w613jpjqyf1.png?width=180&format=png&auto=webp&s=fdd44cfd92278c06c8db042efd151e7eb45c2487

im trying to make roblox animations and im curious on how popular animation youtubers create this glow effect without the ground/walls glowing as well.

https://preview.redd.it/rj4rtmhujqyf1.png?width=409&format=png&auto=webp&s=96541baddd40824bc8b4fae0b9cc216f9a53f423