The "a" in (rgba) and its zero setting (x,x,x,0) is the ALPHA channel that sets the opacity/transparency of the first three combined colors (x,x ... ... <看更多>

background-color:transparent;. background:rgba(0,0,0,0.75);. -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr=#99000000 ... ... <看更多>

RGB Color Values ... Each parameter (red, green, and blue) defines the intensity of the color with a value between 0 and 255. This means that there are 256 x 256 ... ... <看更多>

HTML & CSS for Beginners Part 19: Colors with CSS - hex, rgba, and hsla. Kevin Powell. Kevin Powell. 769K subscribers. Subscribe. ... <看更多>