Rendering decals in dark environment

I made a hex based system. That looks like this: 2021 09 08 20 38 13 - YouTube

I used locators to put positions for hexagons. Then I added decals to each socket location. Later, I did a calculation to find look at rotation and rotated those. The problem is some of them are visible and some of them not. I am not good with lighting. I want to render them just like a texture regardless of lighting, on surface. Are there options for this ?

Hex image: