How to Vertically Center a Container in Bootstrap Using Flexbox and Traditional Methods?

How to Vertically Center a Container in Bootstrap?

When working with Bootstrap, it's common to encounter the need for vertical alignment, particularly within the jumbotron component. This article delves into two approaches to achieve this using the flexible box and traditional methods.

The Flexible Box Approach

With the advent of the flexible box layout, vertical alignment has become significantly simplified. This method leverages the display: flex property and the align-items property set to center.

.vertical-center {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

The Traditional Approach for Legacy Browsers

For internet Explorer 8 and 9 compatibility, a traditional approach utilizing pseudo-elements and inline-block elements is recommended. This method involves creating a pseudo-element with a full height, setting its vertical-align to middle, and setting the display of both the pseudo-element and the container element to inline-block.

.vertical-center {
  height: 100%;
  text-align: center;
  font: 0/0 a;
}

.vertical-center:before {
  content: " ";
  display: inline-block;
  vertical-align: middle;
  height: 100%;
}

.vertical-center > .container {
  max-width: 100%;
  display: inline-block;
  vertical-align: middle;
  font: 16px/1 "Helvetica Neue", Helvetica, Arial, sans-serif;
}

Additional Considerations

• To prevent vertical alignment issues in extra small screens, the height of pseudo-elements can be set to auto or 0 using CSS media queries.
• To ensure footer/header sections remain visible and above other elements, consider using proper positioning and a higher z-index value.

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