Split thead css

How do you about moving

.jexcel > thead > tr > td
{
    position: -webkit-sticky;
    position: sticky;
}

to some separate css class and may be make a new config option for that.

Reason is if table placed into position:fixed; container, when sticky thead behaves a bit strange (places over tbody) on page scrolling down in Chrome browser.

Start by locating the stylesheet rule for .jexcel > thead > tr > td and the configuration entry points for table options. Reproduce the sticky-header behavior inside a position: fixed container in Chrome, then determine how an optional CSS class or configuration setting should control it. Done means the header no longer behaves incorrectly when the option is disabled, while existing behavior remains available.