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CSS 容器背景 10 种颜色渐变Demo（linear-gradient
语法background: linear-gradient(direction,color-stop1,color-stop2,...);direction：用角度值指定渐变的方向（或角度）。color-stop1,color-stop2,
语法background: linear-gradient(direction,color-stop1,color-stop2,...);direction：用角度值指定渐变的方向（或角度）。color-stop1,color-stop2,
