background

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[ <bg-layer> , ]* <final-bg-layer>
    <bg-layer> = <bg-image> || <position> [ / <bg-size> ]? || <repeat-style> || <attachment> || <box> || <box>
    <final-bg-layer> = <bg-image> || <position> [ / <bg-size> ]? || <repeat-style> || <attachment> || <box> || <box> || <'background-color'>
        <bg-image> = <image> | none

<image>
<position>
<bg-size>
<repeat-style>
<attachment>
<box>

radial-gradient()

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<radial-gradient> = radial-gradient(
  [ [ <shape> || <size> ] [ at <position> ]? , |
    at <position>,
  ]?
  <color-stop> [ , <color-stop> ]+
)
    <shape> = circle || ellipse