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body {
background-image: url("chrome://global/skin/media/imagedoc-darknoise.png");
margin: 0;
}
body > :first-child {
display: block;
position: absolute;
margin: auto;
top: 0;
right: 0;
bottom: 0;
left: 0;
background: hsl(0,0%,90%) url("chrome://global/skin/media/imagedoc-lightnoise.png");
color: #222;
}