Box Shadow Generator

The `box-shadow` CSS property adds shadow effects around an element's frame. You can set multiple effects separated by commas. A box shadow is described by X and Y offsets relative to the element, blur and spread radius, and color.

In physical reality, shadows are rarely a single uniform gradient. They have a dark, tight umbra close to the object and a soft, wide penumbra further away. Stacking multiple shadow layers mimics this real-world light behavior, making UI elements look significantly more premium and professional.

By default, a shadow is drawn outside the box. Adding the `inset` keyword draws the shadow inside the box's border, above the background, but below content. It's often used to make elements look pressed in, like input fields or sunken wells.

Neumorphism (or soft UI) is a design style that uses specific lighting and box shadows to make elements appear as if they are extruded from the background material. It is achieved by applying two shadows: one light shadow on the top-left, and one dark shadow on the bottom-right.