Alert: CSS 4.0 Warning Validation - The value "rgb(0, 0, 0, 0.4)" is not valid for the "border" property

Wrapping up my asp core 3 project, I've been addressing various warnings that have popped up. However, one particular warning has me stumped. The CSS property in question is functioning perfectly, adding a touch of transparency to the black border. What could be triggering this warning? PS: Using Visual Studio 2019 as my IDE.

Answer №1

RGBa (Red = 0, Green = 0, Blue = 0, Alpha = 0.4) this varies from rgb(0, 0, 0)

when dealing with borders:

border: 1px solid rgba(0, 0, 0, 0.4)

Answer №2

It is important to note that when utilizing the rgb() syntax, it only accepts three values. If you need to incorporate a fourth alpha value, the appropriate choice would be to utilize rgba().

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