dbarnes dbarnes - 5 months ago 10
HTML Question

How to center a tooltip horizontally on top of a link

I'm trying to get a tooltip box to be inserted on top and centered of an a tag. I have this working for small Text, but I can't seem to get it to center on large text.

I understand it has to do with positioning the box and the arrow but I can't seem to find the right combination to get the arrow centered under the box and the box centered above the a tag.

I'm hoping to accomplish this with just CSS alone.

HTML:

<div>
<a class="tooltip" href="#" title="tooltip">
<span>Text</span>
</a>

</div>
<div> <a class="tooltip" href="#" title="tooltip">
<span>TextTextText</span>
</a>

</div>


CSS:

div {
padding: 150px;
display: inline-block;
background-color: red;
}
.tooltip{
display: inline;
position: relative;
}
.tooltip:hover:after{
background: #333;
background: rgba(0,0,0,.8);
border-radius: 5px;
bottom: 26px;
color: #fff;
content: attr(title);
padding: 10px;
left: -50%;
position: absolute;
z-index: 98;
}
.tooltip:hover:before{
border: solid;
border-color: #333 transparent;
border-width: 6px 6px 0 6px;
bottom: 20px;
content: "";
left: 30%;
position: absolute;
z-index: 99;
}


And here is the fiddle.

I really would appreciate any help I can get.

Answer

If the tooltip doesn't have an explicit width, you could align that horizontally center, by using a negative translateX as follows:

.tooltip:hover:after {
    left: 50%;
    transform: translateX(-50%);
    /* other styles ... */
}

.tooltip:hover:before {
    left: 50%;
    transform: translateX(-50%);
    /* other styles ... */
}

JSFiddle Demo.

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