Use the theme color setting of iterm2 under Mac

1. First open the github of iterm to check your favorite color

https://github.com/mbadolato/iTerm2-Color-Schemes#andromeda
For example, after you select the theme color Blue Matrix, enter iTerm2-Color-Schemes/schemes/

2. Click in the selected theme color, select Raw, and select Save

3. Open the Setting-Profiles-color-Color Presets of iterm

From the Color Presets, choose to import the Blue Matrix.itermcolors file you just downloaded,

and finally restart it.