Achieving Vertical Centering of Bootstrap Carousel Captions

Many users encounter difficulty in vertically aligning carousel captions in Bootstrap, despite efforts to horizontally position them. This issue often arises when the caption becomes misaligned as the screen size changes. Here's a comprehensive solution to resolve this problem.

CSS Transformation for Vertical Alignment

Browser support for CSS's translateY function is widespread, including Internet Explorer 9. This function allows for vertical alignment by translating elements along the y-axis. Add the following lines to your .carousel-caption CSS:

top: 50%;
transform: translateY(-50%);

The caption's default top property is set to 0, but by setting it to 50% and applying a negative translateY of 50%, you center the caption 50% down from the original top position.

Eliminating Extra Bottom Space

To remove the extra bottom space caused by default Bootstrap CSS, include the following line in your .carousel-caption CSS:

bottom: initial;

This line resets the bottom property to its initial state, thereby eliminating the excess space.

Fixing Pixel Blur

If elements are placed on half a pixel, they may appear blurry. To prevent this, apply the following CSS to the parent element, in this case, .item:

-webkit-transform-style: preserve-3d;
-moz-transform-style: preserve-3d;
transform-style: preserve-3d;

This setting improves the way browsers render the elements, ensuring sharpness.

Result

Implementing these CSS changes will vertically center your carousel captions and make them appear sharp on various screen sizes.

Revised HTML and CSS Snippets

<code class="html"><!-- Start JumboCarousel -->
<div id="jumboCarousel" class="carousel slide" data-ride="carousel">

    <!-- Indicators -->
    <ol class="carousel-indicators hidden-xs">
        <li data-target="#jumboCarousel" data-slide-to="0" class="active"></li>
        <li data-target="#jumboCarousel" data-slide-to="1"></li>
        <li data-target="#jumboCarousel" data-slide-to="2"></li>
        <li data-target="#jumboCarousel" data-slide-to="3"></li>
    </ol><!-- end carousel-indicators -->

    <!-- Wrapper for Slides -->
    <div class="carousel-inner" role="listbox">
        <div class="item active" id="slide1">
            <a href="#"><img src="http://placehold.it/1920x720&amp;text=Slide+1" alt="Slide 1"></a>
            <div class="carousel-caption">
                <h1>Check Out this Moose</h1>
                <p class="lead">This text is super engaging and makes you want to click the button.</p>
                <a href="#" class="btn btn-lg btn-primary">Learn More</a>
            </div><!-- end carousel-caption -->
        </div><!-- end slide1 -->
        <div class="item" id="slide2">
            <img src="http://placehold.it/1920x720&amp;text=Slide+2" alt="Slide 2">
            <div class="carousel-caption"></code>

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