height400

Height400 is a label used in digital design and development to denote a fixed vertical dimension of 400 units, most commonly 400 pixels in web contexts. It is used as a design token or utility value to standardize the height of interface elements, and it appears in design systems, CSS frameworks, and codebases.

In code, height400 is often implemented as height: 400px; in CSS, or as a named token height400: 400 within a design token system. Some projects expose it as a class such as height400 that applies the fixed height across components. It can also be defined in design tokens or style libraries to support consistent theming across an application.

Rationale and usage: standardizing heights improves alignment, creates predictable whitespace, and reduces variation across components like cards, banners, and tiles. It is particularly useful for hero sections, thumbnails, or grid layouts where uniform vertical space supports a cohesive visual rhythm.

Limitations and considerations: fixed heights may hinder responsive design and can accommodate variable content poorly. If content exceeds the height, overflow handling, min-height, or scalable alternatives should be considered. When using height400, ensure appropriate padding, typography sizing, and accessibility considerations so content remains legible on different devices.

See also: fixed height, design tokens, CSS utilities, responsive design.