The border-radius Property

Elliptical border - border-radius: 50px / 15px:

Elliptical border - border-radius: 15px / 50px:

Ellipse border - border-radius: 50%:

border-radius	A shorthand property for setting all the four border---radius properties
border-top-left-radius	Defines the shape of the border of the top-left corner
border-top-right-radius	Defines the shape of the border of the top-right corner
border-bottom-right-radius	Defines the shape of the border of the bottom-right corner
border-bottom-left-radius	Defines the shape of the border of the bottom-left corner

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