How CSS box-shadow layers work
A single box-shadow declaration can contain multiple comma-separated shadows. Layering is optional: use one shadow for a simple outline or elevation, and add layers when you want to combine different offsets, blur, spread, or opacity.
Multi-layered Shadows
Shadow layering combines multiple shadows with different offsets, blur, spread, and opacity. It can create a softer or more complex effect than one shadow, but the right values depend on the element and surrounding design.
Understanding Spread vs Blur
A common mistake is treating Blur and Spread equally. Blur controls the feathering on the edges of the shadow. Spread controls the physical expansion (or contraction, if negative) of the shadow's mask overall. To create an "elevation" effect without a bulky halo, front-end developers often use a negative spread coupled with a high blur.
Frequently Asked Questions
Smooth CSS shadows are created by layering multiple `box-shadow` declarations together. Instead of one harsh shadow, you combine several shadows with varying opacities, blurs, and offsets to mimic real physical light dissipation.
The copied value is a standard CSS box-shadow declaration. In Tailwind, add it using the configuration approach supported by your installed Tailwind version, or use an arbitrary shadow utility when its syntax fits the generated value.