For example, you want to set 40% alpha transparence to #000000
(black color), you need to add 66
like this #66000000
.
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/** | |
* Encode string into Base64, as defined by RFC 4648 [http://tools.ietf.org/html/rfc4648]. | |
* As per RFC 4648, no newlines are added. | |
* | |
* Characters in str must be within ISO-8859-1 with Unicode code point <= 256. | |
* | |
* Can be achieved JavaScript with btoa(), but this approach may be useful in other languages. | |
* | |
* @param {string} str ASCII/ISO-8859-1 string to be encoded as base-64. | |
* @returns {string} Base64-encoded string. |
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