GitHub 6740★

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HTML

<div class="tooltip">
<!-- The tooltip content -->
<div class="tooltip__content">
...
</div>

<!-- The tooltip arrow -->
<div class="tooltip__arrow"></div>

<!-- The trigger element -->
...
</div>

CSS

.tooltip {
/* Used to position the arrow */
position: relative;
}

/* Show the arrow and content and restore pointer events when hovering the trigger element */
.tooltip:hover .tooltip__arrow,
.tooltip:hover .tooltip__content
{
opacity: 1;
pointer-events: initial;
}

.tooltip__arrow {
/* Invisible by default */
opacity: 0;

/* To prevent accidental interactions with other elements */
pointer-events: none;

/* Border */
border: 0.5rem solid transparent;
border-top-color: #111827;

/* Position */
bottom: 100%;
left: 50%;
position: absolute;
transform: translate(-50%, 8px);

/* Zero size */
height: 0;
width: 0;

/* Displayed on top of other element */
z-index: 10;
}

.tooltip__content {
/* Invisible by default */
opacity: 0;

/* To prevent accidental interactions with other elements */
pointer-events: none;

/* Background color, must be the same as the border color of arrow */
background-color: #111827;
border-radius: 0.25rem;

/* Position */
bottom: 100%;
left: 50%;
position: absolute;
transform: translate(-50%, -8px);

/* Displayed on top of other element */
z-index: 10;
}
Demo
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