About CSS Box Shadow Generator

Generates CSS box-shadow declarations with a live visual preview. Stack multiple shadow layers for complex effects, adjust offset, blur, spread, color, and opacity per layer. Includes six presets (Subtle, Medium, Elevated, Sharp, Glow, Inset) and customizable preview background, box color, and border radius.

• Each shadow layer is independently configurable: X/Y offset, blur radius, spread radius, color, opacity, and inset toggle
• Multiple layers compose into a single comma-separated box-shadow value\u2014the CSS spec supports unlimited layers
• Opacity is applied via rgba() conversion from the hex color picker, giving finer control than hex alpha
• Preview updates in real time with CSS transitions for smooth visual feedback

Frequently Asked Questions

Why use multiple shadow layers instead of one?

Layered shadows look more natural. A common technique is pairing a tight, dark shadow (contact shadow) with a wide, light one (ambient shadow). This mimics how real-world light diffuses around objects. The Elevated preset demonstrates this pattern.

Can I animate CSS box-shadow without performance issues?

Animating box-shadow directly forces the browser to repaint on every frame. A smoother trick: put the shadow on a pseudo-element and animate its opacity instead. The shadow itself stays static while the visual transition feels identical, at a fraction of the rendering cost.