<!DOCTYPE html>
<html>
<style>
.tooltip {
position: relative;
display: inline-block;
border-bottom: 1px dotted black;
}
.tooltip .tooltiptext {
visibility: hidden;
width: 120px;
background-color: black;
color: #fff;
text-align: center;
border-radius: 6px;
padding: 5px 0;
position: absolute;
z-index: 1;
bottom: 150%;
left: 50%;
margin-left: -60px;
/* 淡入工具提示 - 用 .5 秒从完全不可见变为可见： */
opacity: 0;
transition: opacity .5s;
}
.tooltip .tooltiptext::after {
content: "";
position: absolute;
top: 100%;
left: 50%;
margin-left: -5px;
border-width: 5px;
border-style: solid;
border-color: black transparent transparent transparent;
}
.tooltip:hover .tooltiptext {
visibility: visible;
opacity: 1;
}
</style>
<body style="text-align:center;">
<div class="tooltip">Hover over me
<span class="tooltiptext">Tooltip text</span>
</div>
</body>
</html>
标签：提醒,color,Tooltip,tooltip,tooltiptext,border,css,left From： https://www.cnblogs.com/tcyweb/p/17738275.html