I used two LED diodes and two 3032 battery containers to light it up from the inside. The trench also has notches so the light can come out should you want to add more leds to the inside.

You can reopen it to change out batteries.

things from Amazon:

https://www.amazon.com/gp/product/B095S8SQC9/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B09B56JXYF/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1