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This CSS should achieve something like this:

.wp-show-posts-inner {
	position: relative;
	margin-bottom: 0 !important;
	overflow: hidden;
}

.wp-show-posts-image {
	position: relative;
}

.wp-show-posts-image a {
	display: block;
}

.wp-show-posts-image a:before {
	content: "";
	position: absolute;
	width: 100%;
	height: 100%;
	background-color: rgba(0,0,0,0.8);
	top: 0;
	left: 0;
	right: 0;
	opacity: 0;
	transition: opacity 500ms ease-in-out;
}

.wp-show-posts-image a:hover:before {
	opacity: 1;
}

.wp-show-posts-entry-header {
	position: absolute;
	left: 0;
	bottom: -100px;
	z-index: -1;
	opacity: 0;
	pointer-events: none;
	transition: bottom 500ms ease-in-out, opacity 1s ease-in-out;
}

.wp-show-posts-image:hover + .wp-show-posts-entry-header {
	bottom: 0;
	opacity: 1;
	z-index: 1;
	padding: 20px;
	display: inline;
}

.wp-show-posts-columns .wp-show-posts-entry-title {
	font-size: 18px;
}

.wp-show-posts-entry-title a {
	color: #fff;
}

.wp-show-posts-meta a,
.wp-show-posts-meta a:visited {
    color: rgba(255,255,255,0.7);
}

.wp-show-posts-image {
	margin-bottom: 0;
}