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.alpha-demo{background-color:#ddd;background-image:linear-gradient(45deg,#bbb 25%,transparent 25%),linear-gradient(-45deg,#bbb 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#bbb 75%),linear-gradient(-45deg,transparent 75%,#bbb 75%);background-size:24px 24px;background-position:0 0,0 12px,12px -12px,-12px 0}