Question: Which color will look the brightest on your screen, assuming the background is white?

1. `background-color: #aaa;`
2. `background-color: #999999;`
3. `background-color: rgba(170,170,170,0.5);`
4. `background-color: rgba(170,170,170,0.2);`

Answer: The correct answer of the above question is Option D:`background-color: rgba(170,170,170,0.2);`