Bootstrap Vertical Centering: Comparison of Multiple Methods

The four methods of vertically centering elements in Bootstrap are: d-flex and align-items-center, position and top, CSS Grid, flex-box and margin. The best approach depends on the situation: d-flex is simple and easy to use, suitable for most cases; position and top are suitable for parent elements at fixed heights; CSS Grid provides advanced layout flexibility; flex-box and margin offer lightweight options without horizontal centering.

Bootstrap Vertical Centering: Comparison of Multiple Methods

Vertical centering elements are a common requirement in Bootstrap, and there are several ways to achieve:

Method 1: d-flex and align-items-center

• Use d-flex to set the parent element as an elastic container.
• Add align-items-center utility class to vertically neuter child elements.

 <code class="html"><div class="d-flex align-items-center"> <div>垂直居中的内容</div> </div></code>

Method 2: position and top

• Position the parent element as a relative position.
• Position the child element absolutely and set its top value to half the height of the parent element.

 <code class="html"><div style="position: relative; height: 100px;"> <div style="position: absolute; top: 50%; transform: translateY(-50%);">垂直居中的内容</div> </div></code>

Method 3: CSS Grid

• Use the CSS Grid layout to define the parent element as a grid container.
• Create a row using grid-template-rows: auto and center the content vertically through align-content: center .

 <code class="css">.grid-container { display: grid; grid-template-rows: auto; align-content: center; height: 100px; } .grid-item { grid-row: 1; }</code>

Method 4: flex-box and margin

• Set the parent element to flexbox.
• Add margin: auto to the child element to center it horizontally and vertically.

 <code class="css">.container { display: flex; height: 100px; } .item { margin: auto; }</code>

Which method is the best?

The best approach depends on the situation:

• Method 1 (d-flex) : Suitable for most cases, simple and easy to use.
• Method 2 (position and top) : Applicable only to parent elements with fixed height.
• Method 3 (CSS Grid) : Provides more flexibility for advanced layouts.
• Method 4 (flex-box and margin) : This is a lightweight option without horizontal centering.

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