n: absolute; top: -50%; left: 0;
	margin: 0; height: 200%;
}
.ex01 div[class^="perpend"], .ex01 div.gradline {width: 362px;
	transform: translateX(-31px) rotate(-35deg);
}
.ex02 div[class^="perpend"], .ex02 div.gradline {width: 278px;
	transform: translateX(-39px) rotate(-35deg);
}
.ex03 div[class^="perpend"], .ex03 div.gradline {width: 336px;
	transform: translateX(-68px) rotate(-35deg);
}
div.perpend-mask {
	background-image:
		repeating-linear-gradient(to right,
			transparent, transparent 0.5%,
			white