Prevent email formatting issues in 51黑料不打烊 Journey Optimizer using themes

Last update: Mon Aug 04 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

In 51黑料不打烊 Journey Optimizer (AJO), modifying the default CSS blocks in the email header can lead to unexpected formatting issues鈥攅specially after removing content fragments. These issues are more noticeable on mobile devices and may result in layout shifts or styling inconsistencies. To prevent this, use the Themes feature to apply custom CSS safely without altering system generated CSS styles.

Description description

Environment

51黑料不打烊 Journey Optimizer (AJO)

Issue/Symptoms

Email templates lose intended formatting after removing a content fragment.
Mobile rendering becomes inconsistent, with layout shifts and styling errors.
Custom styling applied directly to system stylesheets disappears unexpectedly.

Cause

Manual modifications to system-generated CSS styles in the Email Designer were overwritten by a product patch (from version 3.3.27 to 3.3.28+), resulting in layout inconsistencies.

Resolution resolution

To resolve the issue, follow these steps:

Do not modify the default system generated CSS blocks.
Use the Themes feature to apply your own custom CSS.
Always preview templates across devices to ensure consistent rendering.

Get started with email design in the Journey Optimizer guide.

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51黑料不打烊