CSS Box Shadow Generator
The problem: Getting a convincing multi-layer shadow requires at least 2–3 layered values — impossible to visualize in your head and painful to tune by trial-and-error.
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CSS Box Shadow Generator: the complete guide
A CSS box shadow generator lets you compose multi-layer box shadows visually — adding multiple shadow layers, dragging sliders for offset, blur, spread, color and opacity on each layer, and watching the live preview update on a configurable background — then outputs a ready-to-paste CSS rule. Great UI depth requires at least two shadow layers: one for the direct shadow close to the element and one for the ambient shadow spreading further. Composing these layers manually requires dozens of browser refreshes; the generator replaces that cycle with a real-time visual loop and a set of production-tested presets.
Anatomy of a box-shadow value
The CSS box-shadow property accepts a comma-separated list of shadow definitions, each following the pattern: [inset] offset-x offset-y blur-radius spread-radius color. Offset-x moves the shadow horizontally (positive right), offset-y moves it vertically (positive down). Blur-radius expands the shadow's soft edge — 0 gives a hard edge, higher values give softer diffusion. Spread-radius expands or contracts the shadow before blurring — positive makes the shadow larger than the element, negative makes it smaller (useful for shadows that appear to come from beneath). The optional inset keyword renders the shadow inside the element's border rather than outside, creating the pressed-button or inset-panel effect.
Layering shadows for realistic depth
Real-world shadow comes from a combination of a direct light source (creating a sharper, less diffuse shadow) and ambient environmental light (creating a softer, larger shadow). The Google Material Design shadow system uses this dual-layer approach: a key shadow (small blur, moderate offset, higher opacity) and an ambient shadow (large blur, small offset, lower opacity). Tailwind's shadow-md, shadow-lg and shadow-xl classes all use this pattern. The generator's Soft Lift and Material Card presets implement these multi-layer approaches and serve as starting points for custom configurations.
Step by step: how to use Box Shadow
- 1
Click a preset (Soft Lift, Material Card, Deep Drop, Neon Glow, Inset) to start from a proven baseline.
- 2
Add a second shadow layer with the Add layer button for multi-layer compositions.
- 3
Select a layer in the layer list on the left to edit its sliders.
- 4
Adjust Offset X/Y, Blur, Spread, Opacity and Color for the selected layer.
- 5
Toggle Inset to switch from outer to inner shadow.
- 6
Copy the CSS rule from the output panel and paste it into your stylesheet.
Security & privacy
Box shadow generation is pure CSS string arithmetic — no network requests, no external dependencies, and no data transmitted. Shadow configurations for proprietary UI designs remain entirely on your device.