Create CSS box shadows with a visual multi-layer editor. Adjust offset, blur, spread, color and opacity for each layer — stack multiple shadows and copy the box-shadow property instantly.
The CSS box-shadow property accepts up to four length values (offset-x, offset-y, blur-radius, spread-radius) plus a color, and optionally the inset keyword. Stacking multiple shadows is done by separating them with commas — this lets you layer depth effects, glows, and borders without additional elements. Box shadows don't affect layout flow and are composited on the GPU in most browsers, making them a cheap alternative to filter:drop-shadow for rectangular shapes. Use spread with a negative value to create inner glows, or a zero-blur large spread for a solid border-like outline.