Opacity, RGBA dan HSLA
<! DOCTYPE  html > < html  lang = "en" > < head >     < meta  charset = "UTF-8" >     < meta  name = "viewport"  content = "width=device-width, initial-scale=1.0" >     < title >Document</ title >     < style >         div {             width : 300 px ;             height : 300 px ;             background-color : red ;             margin : auto ;             opacity : 0.5 ;         }     </ style > </ head > < body >     < div ></ div > </ body > </ html > Opacity opacity : 0.5 ; opacity: memudar kan elemen html Opacity didalam opacity < body >     < div  class = "pertama" >         < div  class = "kedua" ...