btn-group-colors {
	width: 2.75rem;
	height: 2.75rem;
}

.btn-group-square .btn {
	width: calc(1.5em + 2.95rem + 2px);
	height: calc(1.5em + 2.95rem + 2px);
}

.btn-group-colors > .btn::after {
	border: solid 1px gray;
}