What is the color code for transparency in CSS?

Question

Can anyone tell me what is the color code for transparency in CSS like white = \"#FFFFFF\"? As I am using following code, to convert the color codes into int:

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Answer 1

There are now 8-digit hex codes in CSS4 (CSS Color Module Level 4), the last two digit (or in case of the abbreviation, the last of the 4 digits) represents alpha, 00 meaning fully transparent and ff meaning fully opaque, 7f representing an opacity of 0.5 etc.

The format is '#rrggbbaa' or the shorthand, '#rgba'.

Support is lacking for MS browsers, they might be less cooperative or just slower than the other developers, either or both of which actually sealed IE's fate: https://caniuse.com/#feat=css-rrggbbaa