.test-altamira {
	width: 100%;
	font-size: 78.6%; /* sqrt(1/ϕ) */
	border: 1px outset;
	border-spacing: 1px;
	margin: 2ex 0;
}

.test-altamira td,
.test-altamira th
{
	border: 1px inset;
	padding: .33em;
	text-align: center;
}

.test-altamira th {
	font-weight: normal;
	background-color: #ccc;
}