Keep the middle item centered when side items have different widths

Solution 1:

If the left and right boxes would be exactly the same size, I get the desired effect. However when one of the two is a different size the centered box is not truly centered anymore. Is there anyone that can help me?

Here's a method using flexbox to center the middle item, regardless of the width of siblings.

Key features:

pure CSS
no absolute positioning
no JS/jQuery

Use nested flex containers and auto margins:

.container {
  display: flex;
}
.box {
  flex: 1;
  display: flex;
  justify-content: center;
}

.box:first-child > span { margin-right: auto; }

.box:last-child  > span { margin-left: auto;  }

/* non-essential */
.box {
  align-items: center;
  border: 1px solid #ccc;
  background-color: lightgreen;
  height: 40px;
}
p {
  text-align: center;
  margin: 5px 0 0 0;
}

<div class="container">
  <div class="box"><span>short text</span></div>
  <div class="box"><span>centered text</span></div>
  <div class="box"><span>loooooooooooooooong text</span></div>
</div>
<p>&#8593;<br>true center</p>

Here's how it works:

The top-level div (.container) is a flex container.
Each child div (.box) is now a flex item.
Each .box item is given flex: 1 in order to distribute container space equally (more details).
Now the items are consuming all space in the row and are equal width.
Make each item a (nested) flex container and add justify-content: center.
Now each span element is a centered flex item.
Use flex auto margins to shift the outer spans left and right.

You could also forgo justify-content and use auto margins exclusively.

But justify-content can work here because auto margins always have priority.

8.1. Aligning with auto margins

Prior to alignment via justify-content and align-self, any positive free space is distributed to auto margins in that dimension.

Solution 2:

Use three flex items in the container
Set flex: 1 to the first and last ones. This makes them grow equally to fill the available space left by the middle one.
Thus, the middle one will tend to be centered.
However, if the first or last item has a wide content, that flex item will also grow due to the new min-width: auto initial value.

Note Chrome doesn't seem to implement this properly. However, you can set min-width to -webkit-max-content or -webkit-min-content and it will work too.
Only in that case the middle element will be pushed out of the center.

.outer-wrapper {
  display: flex;
}
.item {
  background: lime;
  margin: 5px;
}
.left.inner-wrapper, .right.inner-wrapper {
  flex: 1;
  display: flex;
  min-width: -webkit-min-content; /* Workaround to Chrome bug */
}
.right.inner-wrapper {
  justify-content: flex-end;
}
.animate {
  animation: anim 5s infinite alternate;
}
@keyframes anim {
  from { min-width: 0 }
  to { min-width: 100vw; }
}

<div class="outer-wrapper">
  <div class="left inner-wrapper">
    <div class="item animate">Left</div>
  </div>
  <div class="center inner-wrapper">
    <div class="item">Center</div>
  </div>
  <div class="right inner-wrapper">
    <div class="item">Right</div>
  </div>
</div>
<!-- Analogous to above --> <div class="outer-wrapper"><div class="left inner-wrapper"><div class="item">Left</div></div><div class="center inner-wrapper"><div class="item animate">Center</div></div><div class="right inner-wrapper"><div class="item">Right</div></div></div><div class="outer-wrapper"><div class="left inner-wrapper"><div class="item">Left</div></div><div class="center inner-wrapper"><div class="item">Center</div></div><div class="right inner-wrapper"><div class="item animate">Right</div></div></div>

Keep the middle item centered when side items have different widths

Solution 1:

Solution 2:

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