This page will explain the transparent, currentcolor, and
inherit
The transparent Keyword
The transparent keyword is used to make a color transparent. This is often used to make a transparent background color for an element.
Example
Here, the background color of the <div> element will be fully transparent, and the background image will show through:
body {
background-image: url("paper.gif");
}
div {
background-color: transparent;
}