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CSS Box Shadow Generator

This CSS Box Shadow Generator makes elevation easier to understand by linking each range control directly to a white card on a light surface. You can inspect and copy a single clean box-shadow declaration without downloading an asset or adding a dependency.

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Live result

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Complete source

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Inside the project

How it works

Offset, blur, and spread values are kept separate so you can see the individual role of each part of a box-shadow declaration.
The hex color and opacity are converted into rgba output to produce a valid copy-ready shadow value.
A white card on a pale background makes it easier to judge whether the elevation looks intentional rather than muddy.

Try it yourself

Run and customize it

01Set the horizontal and vertical offset to establish the shadow direction.
02Increase blur gradually, then use spread sparingly to keep the card edge clean.
03Copy the final declaration and validate it against the real background color in your own design.

Learning goals

What to study in this source

Understand the x-offset, y-offset, blur, spread, and color order in box-shadow syntax.
Recognize when a lower-opacity shadow creates clearer hierarchy than a darker shadow.
Avoid applying the same heavy elevation to every element in a page.

Next experiments

Useful ways to customize it

Create a separate hover shadow for cards that are interactive.
Add a subtle inset shadow only when it conveys a distinct pressed or recessed state.
Pair the shadow with a modest border so white cards remain defined in high-light environments.

Common questions

CSS Box Shadow Generator FAQs

What is the order of values in CSS box-shadow?

A basic box-shadow follows horizontal offset, vertical offset, blur radius, optional spread radius, and color. This generator exposes each of those values so you can see how the complete declaration is assembled.

What does spread do in a CSS box shadow?

Positive spread expands the shadow before blur is applied, while negative spread pulls it inward. A small negative spread often helps a soft card shadow stay close to the component instead of looking like a large haze.

Should every card use a box shadow?

No. Use elevation to communicate hierarchy or interactivity, not as decoration on every surface. Flat cards with a border can be clearer when a grid contains many items or the background already has visual texture.

Can I use multiple box shadows on one element?

Yes. CSS accepts comma-separated shadows, which can combine a soft large shadow with a tiny sharper edge. Add multiple layers carefully because too many can make the component look noisy and increase painting work.

Does box-shadow affect layout size?

No. A shadow paints outside an element without changing its box-model dimensions. It can still be clipped if a parent has overflow hidden, so check the surrounding container when the shadow seems to disappear.

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