On the background of gray background, which color of text you choose depends on the effect you want to achieve. Here are some possible suggestions for color matching:

1. white: white is one of the common collocation colors of light gray, which can highlight the calmness of light gray and the freshness of white.

2. Black figures: Black is a very versatile color, which can create a stable and formal atmosphere with a light gray background.

3. Dark gray characters: the combination of dark gray and light gray can form a sense of hierarchy, and at the same time, it can also highlight the lightness of light gray and the depth of dark gray.

4. Blue word: Blue is a very temperament color, and a light gray background can create an elegant and fresh feeling.

5. Red figures: Red is a very bright color, which can highlight the brightness of red and the elegance of light gray on a light gray background.

Generally speaking, light gray background is suitable for matching brighter colors, such as white, light yellow and light green, while dark gray background is suitable for matching more stable colors, such as black, dark gray and blue. Of course, the specific color matching still depends on the content and style you want to express.