CSS property · data last changed 10 Nov 2026
justify-content in email clients
Works in 13 of 21. Not supported in Gmail, Gmail Android, Gmail iOS and 5 more.
Your reader in Outlook Classic sees the email without justify-content, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in Outlook Classic
Use HTML table cell alignment (align="center", align="right") and explicit spacer columns (<td width="20">) to distribute items horizontally. For centering single elements, pair margin: 0 auto on tables with align="center" on container cells for universal cross-client coverage.
There is no drop-in fix for justify-content in Outlook Classic. Design so the email still reads without it.
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justify-content is not among the 24 features we have screenshotted on real installs. The ones we have →
All 21 clients, problems first
| Client | Support |
|---|---|
| Gmail | Not supported |
| Gmail Android | Not supported |
| Gmail iOS | Not supported |
| Outlook Classic | Not supported |
| Yahoo Mail | Not supported |
| Yahoo Mail Android | Not supported |
| Yahoo Mail iOS | Not supported |
| AOL Mail | Not supported |
Works in 13: Outlook 365, Outlook (New), Outlook iOS and 10 more. Show all
| Client | Support |
|---|---|
| Outlook 365 | Works |
| Outlook (New) | Works |
| Outlook iOS | Works |
| Outlook Android | Works |
| Outlook for Mac | Works |
| Apple Mail | Works |
| Apple Mail iOS | Works |
| Samsung Mail | Works |
| Thunderbird | Works |
| HEY Mail | Works |
| Proton Mail | Works |
| Fastmail | Works |
| Superhuman | Works |
How justify-content behaves
The justify-content property defines how the browser distributes space between and around content items along the main axis of a flex container. While values like space-between and center are standard for web headers and button bars, in HTML email justify-content is unsupported by Gmail, Yahoo Mail, and Outlook Classic, which limits its standalone utility for critical layout alignment.
- Gmail drops justify-content entirely, causing child elements to bunch together at the start of the container.
- Outlook Classic ignores justify-content; elements remain aligned based on parent table alignment attributes.
- Apple Mail and Outlook 365 correctly render all justify-content values including space-between, space-around, and space-evenly.
Questions
How do I space items evenly across an email header without justify-content?
Use a multi-cell <table> where each item resides in its own <td>, separated by explicit spacer cells or percentage widths (e.g., width="33%") with text-align: center.
Does justify-content: center work in Gmail?
No. Gmail strips flexbox alignment properties. Use text-align: center on wrapper elements or align="center" on container tables instead.
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