.thumbnail-wrapper {
	position: relative;
	display: inline-block;
	margin: 8px;
}

.thumbnail-wrapper img {
	display: block;
	width: 256px;
	height: auto;
}

.overlay-label {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	background-color: rgba(0, 0, 0, 0.6);
	color: white;
	padding: 4px 8px;
	font-size: 16px;
	font-family: sans-serif;
	border-radius: 4px;
	pointer-events: none; /* クリック操作を邪魔しない */
}