Radial Gradients

Radial gradients are circular or elliptical gradients. Rather than proceeding along a straight axis, colors blend out from a starting point in all directions.

A simple circular gradient to illustrate the standard syntax:
background-image: -moz-radial-gradient(<background-position>, <shape & size>, <start color>, <end color>);

<background-position>position for the center of the gradient.You can use values, percentages, or keywords to set the gradient’s position
<shape & size>shape and size of the gradient
<start color>
<end color>

All the results of the below three are identical.
background-image: -moz-radial-gradient(#FFF, #000);
background-image: -moz-radial-gradient(center, #FFF, #000);
background-image: -moz-radial-gradient(center, ellipse cover, #FFF, #000);

<shape>The shape can take one of two values, circle or ellipse, with the latter being the default.
<size>You can use one of the following values: (closest-side, closest-corner, farthest-side, farthest-corner, contain, cover)
closest-sideThe gradient’s shape meets the side of the box closest to its center (for circles), or meets both the vertical and horizontal sides closest to the center (for ellipses).
closest-cornerThe gradient’s shape is sized so it meets exactly the closest corner of the box from its center.
farthest-sideSimilar to closest-side, except that the shape is sized to meet the side of the box farthest from its center (or the farthest vertical and horizontal sides in the case of ellipses).
farthest-cornerThe gradient’s shape is sized so that it meets exactly the farthest corner of the box from its center.
containA synonym for closest-side.
coverA synonym for farthest-corner.

background-image: -moz-radial-gradient(30px 30px, circle farthest-side, #FFF, #000 30%, #FFF);

Positioning the Gradient
background-image: -moz-radial-gradient(30px 30px, #FFF, #000);

It will place the center of the gradient
- 30 pixels from the top
- 30 pixels from the left of the element
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