1/* ### RGBa example */
2background: rgba(51, 170, 51, .1) /* 10% opaque green */
3background: rgba(51, 170, 51, .4) /* 40% opaque green */
4background: rgba(51, 170, 51, .7) /* 70% opaque green */
5background: rgba(51, 170, 51, 1) /* full opaque green */