How to do vertical centering of bootstrap

Use Bootstrap to implement vertical centering: flexbox method: Use the d-flex, justify-content-center, and align-items-center classes to place elements in the flexbox container. align-items-center class method: For browsers that do not support flexbox, use the align-items-center class, provided that the parent element has a defined height.

Bootstrap vertical centering technology

When using Bootstrap frameworks, it is often necessary to center elements vertically. There are two main ways to achieve this:

1. flexbox method

flexbox is a layout method introduced in Bootstrap 4, which provides more flexible element layout. To achieve vertical centering using flexbox, you can use the following code:

 <code class="html"><div class="container"> <div class="row"> <div class="col-md-12"> <div class="d-flex justify-content-center align-items-center">你的内容</div> </div> </div> </div></code>

In the above code, d-flex class makes the parent element a flexbox container, and justify-content-center and align-items-center classes center the elements horizontally and vertically inside the container, respectively.

2. align-items-center class method

For browsers that do not support flexbox, you can use align-items-center class. This class centers the element vertically within the parent element, provided that the parent element has a defined height.

 <code class="html"><div class="container"> <div class="row"> <div class="col-md-12" style="height: 100px;"> <div class="align-items-center">你的内容</div> </div> </div> </div></code>

Note that when using align-items-center class, the parent element must have a defined height.

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