Hello, Arthur
Thank you for providing a code snippet.
If I may suggest a slight touch-up, we could use HeaderHtmlAttributes instead of ClientHeaderTemplate.
Then we can directly apply the class to the particular column header.
columns.Bound(c => c.Number).HeaderHtmlAttributes(new { @class = "rotate-text" });
If this suggestion does not resolve your problem, please let me know.
Regards,
Georgi Denchev
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