HTML email templates require a different coding approach than modern web pages. Because email clients have varying levels of CSS support, using standard coding practices is essential to ensure they render correctly across different devices and platforms.
1. Key Layout Guidelines
- Use Table Layouts: Many legacy email clients (like older versions of Outlook) do not support Flexbox or Grid. Use tables to structure your email templates.
- Inline Styles: Write CSS styles inline on your HTML elements to prevent email clients from stripping your styles.
<!-- Inline Styled Email Table -->
<table width="100%" cellpadding="0" cellspacing="0" style="background-color:#f4f4f4;">
<tr>
<td align="center" style="padding:20px;">
<h1 style="font-size:24px;color:#333333;margin:0;">Welcome to our Newsletter!</h1>
</td>
</tr>
</table>
2. Media Queries for Mobile Responsiveness
Use media queries with !important declarations to override inline styles and adjust column widths on smaller screens, ensuring your email templates look great on mobile devices. Standard mobile configurations require a wrapper layout class:
@media screen and (max-width: 600px) {
.container-table {
width: 100% !important;
padding: 10px !important;
}
}
3. Client Verification Testing
Ensure that templates are thoroughly audited on tools like Litmus or Email on Acid to test templates against Outlook, Gmail, Apple Mail, and Yahoo Mail client engines, protecting your layouts from visual breakages.