Hello, guys

I have an odd issue with centered text in a epub changed into a kepub ebook by means of "kepub output" Calibre plug in.
In my style sheet I've got this simple class:
.center
{
text-align: center;
text-indent:0;
font-style:italic;
}
I write my epubs directly into Sigil; the preview shows the text as I like it, in the middle of the page, but when I open my converted kepub in my Clara, nothing..it ignores it. Why?