Not all computer keyboards (laptop or desktop) have backlighting. I found an innovative solution in a dual-head LED music stand light.
Each LED light is at the end of a gooseneck arm for easy positioning.
The music stand light I purchased runs off AC and batteries. Others run off USB or just batteries.
The low setting is just right for showing the keys in dark places. USB lights that I previously tried were just too bright.
Here are some examples from Amazon: