The following are several English question and answer titles that match the content of the article: 1. **Why Doesn\'t `margin: auto` Work on Inline-Block Elements?** 2. **How ​​to Center Inline-Block Elements Without `margin: auto`?** 3. **Why Does Margin: Auto Fail for Inline-Bl

Why doesn't margin: auto work on inline block elements?

In CSS, the margin: auto property is used to create even white space around an element. However, it may not work when applying this attribute on an inline block element. This is because inline block elements flow on the page much like text elements.

When you assign the display: inline-block style to an element, it will start flowing on the page as a single word or image. Therefore, margin: auto cannot create a uniform white space because the element itself does not occupy the entire horizontal space.

To fix this problem, you need to set the alignment of the container element to center (text-align: center) instead of trying to center the inline block element directly. The container element will take up the entire horizontal space and will center the inline block element inside it.

Fixed code example:

<code class="css">#container {
    border: 1px solid black;
    display: inline-block;
    padding: 50px;
}
.MtopBig {
    margin: 75px auto;
    position: relative;
}
.center {
    text-align: center;
}</code>

<code class="html"><div class="center">
    <div class="MtopBig" id="container"></div>
</div></code>

By using this method, the inline block element will be successfully centered even though it is no longer directly controlled by the margin: auto attribute.

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