Fluid design
Fluid design is an email layout approach that uses relative, percentage-based widths for columns and content containers rather than fixed pixel measurements, allowing the email to resize smoothly across different screen widths. Rather than specifying that a column is 300 pixels wide, a fluid layout might specify 50 percent of the available width, so as the screen narrows, the column narrows proportionally.
Fluid design is one of three main approaches to email layout adaptation, alongside fixed-width (which uses pixel-defined widths and does not adapt at all) and responsive design (which uses CSS media queries to define specific layout changes at specific breakpoints). Fluid design sits between these: it scales smoothly but does not make dramatic layout changes such as switching a two-column layout to a single column. Modern email design often uses a hybrid of fluid and responsive techniques.
For B2B email marketers and developers, fluid design is most relevant when building templates that need to function across a wide range of email clients with varying CSS support. Media queries are not supported in all email clients, particularly older versions of Outlook. A fluid base layout ensures that the email scales reasonably well even in clients where media queries do not fire, while responsive overrides enhance the experience in the clients that support them.
Complete guide to responsive and fluid email design
Learn how fluid and responsive design techniques work in email, when to use each, and how to build templates that render well across all clients.
What is the difference between fluid and responsive email design?
Fluid email design uses percentage-based widths so that the layout scales proportionally to screen size. Responsive email design uses CSS media queries to apply different layout rules at specific breakpoints, typically switching from a multi-column layout on desktop to a single-column layout on mobile. Fluid design scales gradually and works in clients that do not support media queries. Responsive design creates more intentional layout changes at defined breakpoints but requires media query support. Many modern email templates use both together.
Why would I use fluid design instead of responsive design for email?
Fluid design is a safer baseline in email because it works in clients that do not support CSS media queries, including some versions of Outlook. If your audience includes a significant proportion of users in corporate Outlook environments, building a fluid base layout ensures they get a usable experience even without responsive overrides. Responsive design is more powerful where it is supported, but fluid design provides a functional fallback that degrades gracefully.
What are percentage-based widths in email coding?
In email HTML, percentage-based widths are defined using values like width=’50%’ in table attributes or width: 50% in CSS. This means the element takes up the specified proportion of its parent container’s width rather than a fixed number of pixels. When the parent container is the full email width, a 50 percent column takes up half of whatever width the email is displayed at. This relative sizing is the foundation of fluid design and ensures the layout scales across screen widths without overflow or horizontal scrolling.