How can we disable the direction ltr, in writer to avoid epub validator error?

Libre office offers export to epub. But there is an inherent problem. How can we disable the direction ltr in the program to avoid the error in epub validator?

EPUB Validator (beta)
Detected version: EPUB 3.0.1

Results: The following problems were found in AWESOME GOD 2.epub:

Type File Line Position Message
ERROR OEBPS/styles/stylesheet.css 59 3 The ‘direction’ property must not be included in an EPUB Style Sheet.
Validated using EPUBCheck version 4.1.1.

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