What are the methods for vertical and horizontal centering in CSS?

This time I will bring you some methods of CSS vertical and horizontal centering, and notes on CSS vertical and horizontal centering. The following is a practical case, let’s take a look.

CSS center alignment

• The browser prefix is ​​omitted in the code

• The following examples are sorted according to my personal standards

• Of course there are more centering methods, but I think only these 5 methods are the most complete solutions

flex centering

Advantages: Can center unknown heights

<style>
    .wrap{height: 100%;display: flex; justify-content: center; align-items: center;align-content:center;}
    
    .other{background-color: #ccc; width: 400px;height: 400px;} /* 额外的样式 可去除 */
</style>
<p class="wrap">
    <p class="other">
        <h2>这是第二层的内容 不会居中</h2>
    </p>
</p>

position + translate Centering

Advantages: Can center unknown heights, with minimum nesting levels

<style>
    /* position 可选 absolute|fixed*/
    .center{position: absolute;left: 50%;top: 50%; transform: translate(-50%,-50%);}
    
    .other{background-color: #ccc; } /* 额外的样式 可去除 */
</style>
<p class="center other">
    <h2>这一层的内容 不会居中</h2>
</p>

table-cell Centering

Disadvantages: 1. The center layer needs to set the width (.center). 2. The outer layer is nested one layer (.cell) 3. The width of the center layer must be set (% allowed)

<style>
    .wrap{display: table;width: 100%;height: 100%;}
    .cell{display: table-cell;vertical-align:middle;}
    .center{width: 400px;margin-left:auto;margin-right:auto;}
    .other{background-color: #ccc;  height: 400px;} /* 额外的样式 可去除 */
</style>
<p class="wrap">
    <p class="cell">
        <p class="center other">
            <h2>这一层的内容 不会居中</h2>
        </p>
    </p>
</p>

Traditional centering (2 types)

Disadvantages: 1. The margin value must for auto. 2. The center layer must have a fixed height and width (% allowed) 3. Position

<style>
    /*
        1. left、top、right、bottom 可以任意,但必须相等
        2. position 可选 absolute|fixed
    */
    .center{position: absolute;left: 10px;top: 10px;right: 10px;bottom: 10px;margin: auto;width: 400px;height: 400px;}
    .other{background-color: #ccc; } /* 额外的样式 可去除 */
</style>
<p class="center other">
    <h2>这一层的内容 不会居中</h2>
</p>

must be used Disadvantages: The center layer must have a fixed height and width, and magin needs to be calculated from the height and width.

<style>
    .wrap{position: relative;height: 100%;}
    .center{position: absolute;left: 50%;top: 50%; width: 400px;height: 300px; margin-left: -200px;margin-top: -150px;}
    .other{background-color: #ccc; } /* 额外的样式 可去除 */
</style>
<p class="wrap">
    <p class="center other">
        <h2>这一层的内容 不会居中</h2>
    </p>
</p>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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