🎭 CSS Box Shadow Generator

CSS box-shadow adds shadow effects around an HTML element's frame. It is defined by horizontal offset (X), vertical offset (Y), blur radius, spread radius, color, and an optional inset keyword. Box shadows do not affect layout — they are purely visual and do not change the element's size or position.

Yes. CSS supports multiple comma-separated box-shadow values on a single element. Multiple layers create more realistic depth. For example, combining a tight shadow with low blur and a wider shadow with high blur mimics natural light more accurately than a single shadow.

Neumorphism (new skeuomorphism) is a design style where elements appear to extrude from the background using two shadows — a light shadow on one side and a dark shadow on the other. It creates a soft, embossed look. This generator includes neumorphism presets for both light and dark backgrounds.

Add the inset keyword before the shadow values: box-shadow: inset 0 2px 4px rgba(0,0,0,0.1). Inset shadows appear inside the element instead of outside, creating a pressed or sunken effect. They are commonly used for input fields, buttons in active/pressed states, and card footers.

Simple box shadows have minimal performance impact on modern browsers. However, avoid animating box-shadow directly (it triggers paint operations on every frame). Instead, animate opacity or transform on a pseudo-element that has the shadow. For design systems, define shadow tokens (shadow-sm, shadow-md, shadow-lg) and apply them as classes rather than computing shadows dynamically.