テキスト<div class="cp_tooltip">マウスオーバーテキスト<span class="cp_tooltiptext">ツールチップテキスト</span></div>テキスト

.cp_tooltip {
	position: relative;
	display: inline-block;
	cursor: pointer;
	background: linear-gradient(transparent 60%, #f19ec2 60%);
}
.cp_tooltip .cp_tooltiptext {
	position: absolute;
	z-index: 1;
	bottom: 100%;
	left: 0;
	visibility: hidden;
	width: auto;
	white-space: nowrap;
	padding: 0.3em 0.5em;
	transition: opacity 1s;
	text-align: center;
	opacity: 0;
	color: #ffffff;
	border-radius: 6px;
	background-color: #da3c41;
}
.cp_tooltip .cp_tooltiptext::after {
	position: absolute;
	top: 100%;
	left: 50%;
	margin-left: -5px;
	content: ' ';
	border: 5px solid transparent;
	border-top-color: #da3c41;
}
.cp_tooltip:hover .cp_tooltiptext {
	visibility: visible;
	opacity: 1;
}