Flex alignment properties allocate unoccupied space within a container. Therefore, automatically centering a flex item surrounded by others is impossible unless the combined width of the neighboring items equals the width of the container.
Consider the second example provided. The total width of the span elements is equal on both sides of the h2 element. Consequently, the h2 is perfectly centered in the container.
<code class="css">.container { display: flex; justify-content: center; align-items: center; border: 1px solid red; margin: 5px; padding: 5px; } p { text-align: center; } p > span { background-color: aqua; padding: 5px; }</code>
<code class="html"><div class="container"> <span>I'm span 1</span> <span>I'm span 2</span> <span>I'm span 3</span> <h2>I'm an h2</h2> <span>I'm span 4</span> <span>I'm span 5</span> <span>I'm span 6</span> </div> <p><span>TRUE CENTER</span></p></code>
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