Page style files (design themes) have been updated.
During migration, these CSS style sheet files in your application are replaced with updated files from the current design theme folder.
Styles\BaseStyles.css
Styles\BaseStyles.LeftToRight.css
Styles\BaseStyles.RightToLeft.css
Any changes you have made to these CSS style sheet files will be lost.
After migration, re-apply any changes you may have made to your application’s original CSS style sheet files to the new CSS style sheet files in your application. We strongly encourage you to place your CSS style sheet customizations in Styles.css, which is not affected by the migration process.
Version 6.1 Application Migration