Color alpha transparency

[quote=Apos]Is there a way to have transparent colors? For example: [code][color=#facc15]Hello[/color][/code] [color=#facc15]Hello[/color] I thought I could add this to the end of the hex code to get alpha: [code][color=#facc1530]Hello[/color][/code] [color=#facc1530]Hello[/color] But it looks like that hex format isn't supported. Reference: [url=https://developer.mozilla.org/en-US/docs/Web/CSS/hex-color]https://developer.mozilla.org/en-US/docs/Web/CSS/hex-color[/url] It's the #RRGGBBAA line.[/quote]