What Is CSS Box Shadow?
The CSS `box-shadow` property adds shadow effects around an element's frame. You can set multiple shadows on one element, separated by commas. Each shadow requires values for: horizontal offset, vertical offset, blur radius, spread radius, color, and whether the shadow is inset (inner shadow) or outset (default outer shadow).
```
`box-shadow: [h-offset] [v-offset] [blur] [spread] [color] [inset?]
/* Example */
box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);`
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## How to Use the CSS Box Shadow Generator Online
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## Understanding Each Shadow Parameter
- **Horizontal offset**: Positive values move the shadow right; negative values move it left.
- **Vertical offset**: Positive values move the shadow down; negative values move it up.
- **Blur radius**: Higher values create a more diffuse, softer shadow. 0 = hard edge shadow.
- **Spread radius**: Positive values expand the shadow; negative values shrink it. A large negative spread with no blur creates a realistic "contact shadow".
- **Color/opacity**: Use rgba() with low opacity for natural-looking shadows. Pure black (rgba(0,0,0,0.1-0.3)) works well for most UI shadows.
- **Inset**: Makes the shadow appear inside the element, creating a sunken or pressed effect.
## Key Features
- **Visual sliders** for all parameters with real-time preview.
- **Multiple shadow layers** — add up to 5 shadow layers for complex effects.
- **Inset/outset toggle** for inner and outer shadows.
- **Shadow presets** — popular shadow recipes from Tailwind, Material UI, and similar design systems.
- **Background color picker** — see how the shadow looks on different backgrounds.
- **Copy to clipboard** — one-click CSS copy.
## Popular Shadow Presets
```
`/* Subtle card shadow (Tailwind shadow-sm) */
box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
/* Default card shadow (Tailwind shadow) */
box-shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
/* Large elevated shadow (Tailwind shadow-lg) */
box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
/* Neumorphic inset effect */
box-shadow: inset 2px 2px 5px rgba(0,0,0,0.15), inset -2px -2px 5px rgba(255,255,255,0.8);`
**→ Try CSS Box Shadow Generator Free at DevKits**
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## Frequently Asked Questions
### Can I apply multiple box shadows to one element?
Yes. Separate multiple box-shadow values with commas. Multiple shadows are applied from front to back in the order listed. This is essential for creating realistic depth effects like Material Design's elevation shadows.
### What's the difference between box-shadow and filter: drop-shadow?
`box-shadow` follows the element's rectangular bounding box, ignoring transparent areas. `filter: drop-shadow()` follows the actual visible content (including transparency), making it better for non-rectangular elements and PNG images with transparency.
### Why does my box shadow not appear on certain elements?
Box shadows can be hidden if the element is overflow:hidden on a parent, if the element itself has overflow:hidden clipping the shadow, or if z-index stacking context issues hide the shadow behind other elements.
### Are there performance concerns with box-shadow?
Complex box shadows can trigger paint operations during animations. For animated elements, consider using `filter: drop-shadow()` or a pseudo-element shadow instead, as these can be GPU-composited.
### Is the tool free?
Yes, completely free with no signup required.
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Originally published at aiforeverthing.com
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