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a {  margin: -webkit-calc(5% + 5px) -webkit-calc(10% + 10px);  margin: calc(5% + 5px) calc(10% + 10px);  background: -webkit-linear-gradient(black, white), -webkit-radial-gradient(white, black);  background: -o-linear-gradient(black, white), -o-radial-gradient(white, black);  background: linear-gradient(black, white), radial-gradient(white, black);  content: " linear-gradient(black, white) ";}