materio-base-d7/themes/bartik/css/layout-rtl.css

/* ---------- Basic Layout RTL Styles ----------- */

#content,
#sidebar-first,
#sidebar-second,
.region-triptych-first,
.region-triptych-middle,
.region-triptych-last,
.region-footer-firstcolumn,
.region-footer-secondcolumn,
.region-footer-thirdcolumn,
.region-footer-fourthcolumn {
  float: right;
}
.region-header {
  float: left;
}
#secondary-menu {
  left: 0;
  right: auto;
}