how to style the height of iframe textarea of CLEditor?

how to style the height of iframe textarea of CLEditor?
it has a inline style of height there.i tryed use height:*px !important ,it did style the height of CLEditor.
but it made the expand not working.also i tryed use min-height:*px !important to style it ,but failed.
vanilla 2.1b2 WYSIWYG (CLEditor)1.2.7
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