.base {
	border-top-style: none;
	border-right-style: double;
	border-bottom-style: double;
	border-left-style: double;
}

.rc {
	border-top-style: none;
	border-right-style: none;
	border-bottom-style: double;
	border-left-style: none;
}

.all {
	border: double;

}
.top {
	border-top-style: double;
	border-right-style: double;
	border-bottom-style: none;
	border-left-style: double;
}