CSS Box Shadow Generator
Visual CSS box-shadow generator supporting multi-layer smooth elevation, inset shadows, custom RGBA colors, and 1-click Tailwind CSS copy.
Input Parameters
Live Result
Details
Steps
Configured base spatial offsets: Horizontal (X) = 0px, Vertical (Y) = 12px
Set shadow diffusion: Blur Radius = 30px, Spread Radius = -6px
Formatted color transparency and inset mode: rgba(0, 0, 0, 0.08) (Drop Outer)
Synthesized 2 layer(s) into W3C CSS rule: box-shadow: 0px 5px 11px -3px rgba(0, 0, 0, 0.04), 0px 12px 30px -6px rgba(0, 0, 0, 0.048);
Quick Answer & Understanding Your Result
A CSS Box Shadow Generator creates custom `box-shadow` property declarations with multi-layer smooth elevation, inset inner shadows, and Tailwind CSS arbitrary classes, enabling realistic depth, neumorphism, and card elevation in web interfaces.
Core CSS Box-Shadow Parameters
- Horizontal Offset (X): Shifts the shadow horizontally along the X-axis (positive values cast shadow to the right, negative to the left).
- Vertical Offset (Y): Shifts the shadow vertically along the Y-axis (positive values cast shadow downwards, simulating overhead lighting).
- Blur Radius: Controls Gaussian blur diffusion radius (higher values create softer, more ambient light spread).
- Spread Radius: Expands or shrinks the shadow footprint before blurring (negative values prevent harsh dark borders).
- Smooth Layering (Elevation): Stacks multiple progressive shadow declarations with logarithmic opacity for natural optical depth.
Formula & Calculation Logic
Mathematical FormulaSyntax structure:
- Applies X-offset, Y-offset, Gaussian blur radius, spread distance, and RGBA color opacity per W3C CSS specification.
Step-by-Step Guide
Adjust Spatial Offsets
Use the X and Y sliders to set the directional angle of the light source.
Configure Blur & Spread
Fine-tune Blur Radius for softness and Spread Radius to control shadow footprint size.
Select Color & Layer Count
Pick a transparent RGBA shadow color and choose between 1-layer crisp or multi-layer smooth elevation.
Copy CSS & Tailwind Code
Click 1-Click Copy to grab the standard CSS rule or Tailwind CSS arbitrary class.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Tailwind-Style Soft Floating Card Elevation | Stacks two subtle layers to produce natural ambient diffusion without harsh bounding edges. | ||
| Neumorphic Soft Inset Shadow | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
W3C CSS Backgrounds and Borders Module Level 3 - Section 6: Box Shadows
Mozilla Developer Network (MDN) - CSS box-shadow Reference
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: box-shadow: [inset] X Y Blur Spread Color
Last Reviewed: August 21, 2026
Primary Source: W3C CSS Backgrounds and Borders Module Level 3 - Section 6: Box Shadows
Reference Document: Mozilla Developer Network (MDN) - CSS box-shadow Reference
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.