css 背景色渐变---和背景色透明

1 背景色渐变 　 　　background:#fb0000; background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#fb0000), color-stop(15%,#d50000), color-stop(75%,#c70000), color-stop(100%,#b20000));

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