Both of these colors use the rgba function to specify the red-green-blue values, plus an alpha transparency value.
这两种颜色都使用rgba函数来指定“红-绿-蓝”值，以及一个alpha透明度值。
Don't forget you can use RGBA values for the shadow color.
别忘了，你可以在阴影颜色中应用rgba值。
Use HSLA instead of RGBA for semi-transparent white, as it has slightly fewer characters and is quicker to type, due to the lack of repetition.
推荐使用hsla而不是rgba来产生半透明的白色，因为它的字符长度更短，打起来也更快。这归功于它的重复度更低。
Use HSLA instead of RGBA for semi-transparent white, as it has slightly fewer characters and is quicker to type, due to the lack of repetition.
推荐使用hsla而不是rgba来产生半透明的白色，因为它的字符长度更短，打起来也更快。这归功于它的重复度更低。
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