Table caption center align

Table x = new Table("Table Caption");
The "Table Caption" will be on left side of table, is there a way to make it on center of table.
I tried the following style, the text was changed, but the align won't
x.setStyleName("centertable");

    .v-caption-centertable .v-captiontext {
        text-align:center;
        font-weight: bold;        
        float:right;
    }

Thank you in advance!
 

The following should work. Did you tried it?

.v-caption-centertable {text-align: center;}

Yes, I have that in my style already.
It doesn't work.

Yes, that's what I want.
I found the problem.
Thanks!