~78 radial gradient

1、radial-gradient Radial Gradient （ Radioactive effects ）, By default, the shape of the radial gradient center is calculated according to the shape of the element

Square --> circular

Rectangle --> ellipse

2、 You can manually specify the size of the radial gradient

circle（ circular ）

ellipse（ The ellipse ）

3、 You can specify the position of the gradient

grammar ：radial-gradient（ size at Location , Color Location , Color Location , Color Location ）

size ：circle circular 、ellipse The ellipse 、closest-side Near 、closest-corner near post 、farthest-side Far side 、

farthest-corner far post

Location ：top、right、left、center、bottom

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