What is "box-shadow" in web design?
In web interface design, the concept of box-shadow is a CSS visual property used to add shadows to HTML elements such as divs, buttons, images, and more. This technique contributes to visual depth and hierarchy, creating a layered look and helping highlight certain elements in the interface.
Main Features of box-shadow
1. Aesthetic and Depth
Box-shadow allows designers to simulate lighting and give a three-dimensional appearance to elements that are otherwise flat by default. It helps guide the user's eye, highlighting content boxes, buttons, and panels.
2. Detailed Customization
The property supports several parameters to control how the shadow behaves:
- offset-x:
- horizontal shadow offset (positive to the right, negative to the left)
- offset-y:
- vertical shadow offset (positive downward, negative upward)
- blur-radius:
- the degree of blur applied to the shadow
- spread-radius:
- (optional) how far the shadow spreads beyond the element's size
- color:
- the shadow color, which can include transparency
- inset:
- (optional) inverts the shadow inward instead of casting it outward
When to Use box-shadow?
- To emphasize a button or interactive area
- To simulate layers (e.g., stacked cards)
- To create subtle separation between sections on a page
- To highlight modals or pop-ups
Practical Tip
Avoid overusing shadows: very dark, large, or highly blurred shadows can cause visual clutter. Prefer soft, consistent shadows that align with the overall design aesthetic.