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body {
margin: 0;
}
.reftest {
width: 160px;
height: 160px;
background-size:
160px 40px, 160px 40px, 160px 40px, 160px 40px,
40px 160px, 40px 160px, 40px 160px, 40px 160px;
background-position:
0px 0px, 0px 40px, 0px 80px, 0px 120px,
0px 0px, 40px 0px, 80px 0, 120px 0;
background-repeat: no-repeat;
background-image: url(as-image/red100x100.png),
url(as-image/green100x100.png),
url(as-image/blue100x100.png),
url(as-image/brown100x100.png),
url(as-image/red100x100.png),
url(as-image/green100x100.png),
url(as-image/blue100x100.png),
url(as-image/brown100x100.png);
}