With this simple tool you could generate pixelArt one-element css box-shadow following these few steps:
1. Simply create a grid depending on your needs and set the pixel size for the output. Then toggle the panels (left, right and bottom).
2. On the left side, set some color presets. You could add up to 13 and manage it just clicking on the number or triggering the numbero on the keyboard (only from 1 to 9).
3. On the right side, preview your one-element box-shadow generated.
4. On the bottom you could copy the CSS generated code.
This is a beta release. Hope you enjoy it and appreciate your comments to improve this tool.