Corner Radii

Corner Radii sizes the inner radius of a nested shape so its corner stays concentric with the one around it. Set the outer radius, the padding and the card size, and the inner radius follows as outer minus padding, floored at zero, with the working written out in plain words beneath the controls. The inner value can also be set by hand to see how it breaks, and a redlines overlay annotates the card with its radii, padding and dimensions.