How would I code the following?

Create a style rule for the section#center article selector that adds the following: a) a radial gradient to the background with a white center with a color stop of 30% transitioning to rgb(151, 151, 151), b) a 1-pixel solid border with color value rgb(151, 151, 151) and a radius of 50 pixels, and c) a box shadow with horizontal and vertical offsets of 10 pixels with a 20-pixel blur and a color of rgb(51, 51, 51).

Thank you!