table.button {
	margin:2px;
	border-radius:8px;
	background:#94c5fa; }
	
table.button:hover {
	background:#005aa0;}
	
td.button {
	padding:4px; 
	color:white;
	font-size:11pt;
	font-weight:bold;	}

.reveal-if-active {
  opacity: 0;
  max-height: 0;
  overflow: hidden;
}

input[type="radio"]:checked ~ .reveal-if-active,
input[type="checkbox"]:checked ~ .reveal-if-active {
  opacity: 1;
  max-height: 100px; /* little bit of a magic number :( */
  overflow: visible;
}