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caption.css

li#figure{
	display: block;
	position: relative;
	overflow: hidden;
	width: 200px;
}
#cap-one {
	position: absolute;
	top: 0;
	left: 0;
	z-index: 2;
	width: 100%;
	height: 100%;
	background: rgba(0,0,0,0.3);
	transition: 0.5s;
	opacity: 0;
}
#figure:hover #cap-one {
	opacity: 1;
}
h3, p {
	padding: 10px;
	color: #FFF;
}

li#figure2 {
	position: relative;
	overflow: hidden;
	width: 200px;
}
#cap-two {
	position: absolute;
	top: -100%;
	left: 0;
	z-index: 2;
	width: 100%;
	height: 100%;
	background: rgba(0,0,0,0.3);
	transition: 0.3s;
	opacity: 1;
}
#figure2:hover #cap-two {
	top: 0;
	left: 0;
}

CSSのみで実装するキャプションエフェクト 20 | NxWorld