A.陰影的顏色B.陰影水平偏移值C.陰影垂直偏移值D.陰影的模糊度
A.background:linear-gradient(left,#ff0,0%,#f00,100%); B.background:linear-gradient(top,#ff0,0%,#f00,100%); C.background:linear-gradient(top,#ff00%,#f00100%); D.background:linear-gradient(left,#ff00%,#f00100%);
A.:after B.:visited C.:before D.:active