#square7 .column {
	position: absolute;
	left: 0;
	top: 0;
	width: 2vmin;
	color: #ffffff;
	line-height: 1.1;
	text-align: center;
	font-size: 2vmin;
	font-family: monospace;
}

#square7 .letter {
	display: block;
	animation: square7Fade 1s forwards;
}

@keyframes square7Fade {
	0% {
		opacity: 0.5;
	}
	100% {
		opacity: 0;
	}
}

#square7 .letter.on {
	font-weight: bold;
	opacity: 1;
	animation: none;
}