<!DOCTYPE html>
<html>
<style>
.tooltip { position: relative;
display: inline-block;
border-bottom: 1px dotted black;
}
.tooltip .tooltiptext { visibility: hidden;
width: 120px;
background-color: #555;
color: #fff;
text-align: center;
border-radius: 6px;
padding: 5px 0;
position: absolute;
z-index: 1;
bottom: 125%;
left: 50%;
margin-left: -60px;
opacity: 0;
transition: opacity 0.3s;
}
.tooltip .tooltiptext::after { content: "";
position: absolute;
top: 100%;
left: 50%;
margin-left: -5px;
border-width: 5px;
border-style: solid;
border-color: #555 transparent transparent transparent;
}
.tooltip:hover .tooltiptext { visibility: visible;
opacity: 1;
}
</style>
<body style="text-align:center;">
<h2>工具提示</h2>
<p>将鼠标移动到以下文本上：</p>
<div class="tooltip">将鼠标悬停在我身上
<span class="tooltiptext">工具提示文本</span>
</div>
</body>
</html>