SharePoint Custom Themes are not applying properly after migration to 2013

Question

HI All,

When, we have migrated SharePoint 2010 farm to 2013. we have observed that themes are not applied properly on newly created sites with 2010 compatibility mode.

Upon checking the uls logs we have found that it is trying to find core.css file but for new sites in 2013 (With 2010 compatibility mode) it is having themed.css. Hence the page are not showing properly.

Currently we are renaming the file to resolve the issue, but looking for a permanent fix as it is a custom theme and we create more sites often.

Thanks & Regards,
Arul

Answer 1

Hi @Arul J ,

In SharePoint 2013, the UI is totally different from SharePoint 2010. This UI is built by using new CSS styles, themes, and master pages.

For custom CSS,

You could refer to this article for more details:

https://learn.microsoft.com/en-us/sharepoint/upgrade-and-update/branding-issues-that-may-occur-when-upgrading-to-sharepoint-2013

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