h5+css3鼠标悬浮图片出现标题遮罩效果

实现遮罩的css代码
.homepanylist li a i {
	display: block;
	position: absolute;
	left: 0;
	bottom: -24px;
	width: 204px;
	height: 24px;
	background: #474747;
	z-index: 5;
	opacity: 0.5;
	filter: alpha(opacity=50);
	transition: bottom 0.2s;
	-webkit-transition: bottom 0.2s;
	-moz-transition: bottom 0.2s;
	-o-transition: bottom 0.2s;
}

.homepanylist li a em {
	display: block;
	position: absolute;
	left: 0;
	bottom: -24px;
	width: 204px;
	height: 24px;
	font-style: normal;
	line-height: 26px;
	color: #fff;
	text-align: center;
	z-index: 6;
	transition: bottom 0.2s;
	-webkit-transition: bottom 0.2s;
	-moz-transition: bottom 0.2s;
	-o-transition: bottom 0.2s;
}

.homepanylist li a:hover i,.homepanylist li a:hover em {
	display: block;
	bottom: 0;
	transition: bottom 0.2s;
	-webkit-transition: bottom 0.2s;
	-moz-transition: bottom 0.2s;
	-o-transition: bottom 0.2s;
}