1. yellow ~ transparent
2. Wanted midway color (255,255,0,0.5)
3. yellow ~ white
4. tiles
5. yellow ~ rgba(255,255,0,0.0)
6. yellow ~ rgba(255,255,255,0.0)
6. yellow ~ rgba(127,127,127,0.0)
7. yellow ~ rgba(0,0,0,0.0)

Change background color