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.box1 { border-radius: 10px; }
/* Corners have rounding made from a circle with a radius of 10 pixels. */
.box2 { border-radius: 10px 20px; }
/* Top-left and bottom-right corners have rounding made from a circle with a radius of 10 pixels.
Top-right and bottom-left corners have rounding made from a circle with a radius of 20 pixels. */
.box3 { border-radius: 10px 20px 30px 40px / 5px 10px 15px 20px; }
/* Top-left corner has rounding made from an ellipse with a horizontal radius of 10 pixels and a vertical radius of 5 pixels.
Top-right corner has rounding made from an ellipse with a horizontal radius of 20 pixels and a vertical radius of 10 pixels.
Bottom-right corner has rounding made from an ellipse with a horizontal radius of 30 pixels and a vertical radius of 15 pixels.
Bottom-left corner has rounding made from an ellipse with a horizontal radius of 40 pixels and a vertical radius of 20 pixels. */