Here is how you can do it with some changes in CSS.
.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: -215%;
left: 50%;
margin-left: -60px;
opacity: 0;
transition: opacity 0.3s;
}
.tooltip .tooltiptext::after {
bottom: 100%;
left: 50%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
border-color: rgba(136, 183, 213, 0);
border-bottom-color: #555;
border-width: 6px;
margin-left: -6px;
}
.tooltip:hover .tooltiptext {
visibility: visible;
opacity: 1;
}
<div style="text-align:center;">
<h2>Tooltip</h2>
<p>Move the mouse over the text below:</p>
<div class="tooltip">Hover over me
<span class="tooltiptext">Tooltip text</span>
</div>
</div>