Vorlach:WI/styles.css

.explain-word {
	text-decoration: underline;
	text-decoration: underline dotted;
	position:relative;
	cursor: help;
	user-select: none;
}

.explain-word > span {
	position: absolute;
	display: block;
	top: 100%;
	left: 50%;
	transform: translate(-50%, 0);
	border: 1px solid #000;
	padding: .3em;
	background: #fff;
	border-radius: .5em;
	min-width: 10em;
	max-width: 18em;
	box-shadow: 5px 5px 7px #666;
	font-style: normal;
}

.explain-word > .hidden {
	display: none;
}