A handy guide to vertically centering an image within a carousel using Bootstrap

Hello, I am a new member of this community and consider myself an inexperienced coder.
I have encountered an issue with my carousel images and would like them to be centered by height.
The images are larger than the carousel itself, so I want to center them to show the best part of the photo rather than just the upper portion.
Here is my current carousel: example1
And here is how I would prefer it to look (opaque part represents the rest of the image): example2
I hope that explanation makes sense.
Below is the code snippet:
HTML

    <!--Carousel Wrapper-->
<div id="carousel-home" class="carousel slide carousel-fade" data-ride="carousel">
    <!--Indicators-->
    <ol class="carousel-indicators">
        <li data-target="#carousel-home" data-slide-to="0" class="active"></li>
        <li data-target="#carousel-home" data-slide-to="1"></li>
        <li data-target="#carousel-home" data-slide-to="2"></li>
    </ol>
    <!--Slides-->
    <div class="carousel-inner" role="listbox">
        <div class="carousel-item active">
            <div class="view">
                <img class="d-block w-100 mx-auto" src="imgs/slider/1.png" alt="First slide">
            </div>
            <div class="carousel-caption">
                <h3>Light mask</h3>
            </div>
        </div>
        <div class="carousel-item">
            <img class="d-block w-100 mx-auto" src="imgs/slider/2.png" alt="Second slide">
            <div class="carousel-caption">
                <h3>Strong mask</h3>
            </div>
        </div>
        <div class="carousel-item">
            <img class="d-block w-100 mx-auto" src="imgs/slider/3.png" alt="Third slide">
            <div class="carousel-caption">
                <h3>Slight mask</h3>
            </div>
        </div>
    </div>
    <!--Controls-->
    <a class="carousel-control-prev" href="#carousel-home" role="button" data-slide="prev">
        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
        <span class="sr-only">Previous</span>
    </a>
    <a class="carousel-control-next" href="#carousel-home" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>
</div>

CSS:

.carousel-inner 
{ 
width:100%; 
max-height:350px; 
}
.carousel-caption 
{
    text-align: center;
    bottom: 70%;
}

Answer №1

It appears that the desired action is to crop the image based on its height.

Therefore, utilizing object-fit may not be the optimal solution. Below is a CSS workaround tailored to your inquiry.

To achieve this effect, you can apply img-crop to the <img> tag and fine-tune the percentage accordingly. Be mindful that this approach relies on the original height of the image.

.carousel-inner 
{ 
width:100%;
max-height:350px; 
}
.carousel-caption 
{
    text-align: center;
    margin-top: 20%;
}

/*CSS workaround begins here*/
.carousel-item {
  overflow:hidden;
}

img.crop-img {
/*Adjust the percentage based on the image's height*/
/*Experiment with different values to observe changes in appearance*/
  margin-top: -20%;
  margin-bottom: -15%;
}
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

    <!--Carousel Wrapper-->
<div id="carousel-home" class="carousel slide carousel-fade" data-ride="carousel">
    <!--Indicators-->
    <ol class="carousel-indicators">
        <li data-target="#carousel-home" data-slide-to="0" class="active"></li>
        <li data-target="#carousel-home" data-slide-to="1"></li>
        <li data-target="#carousel-home" data-slide-to="2"></li>
    </ol>
    <!--Slides-->
    <div class="carousel-inner" role="listbox">
        <div class="carousel-item active">
            <div class="view">
                <img class="crop-img d-block w-100 mx-auto" src="https://i.sstatic.net/0oBPS.jpg" alt="First slide">
            </div>
            <div class="carousel-caption">
                <h3>Light mask</h3>
            </div>
        </div>
        <div class="carousel-item">
            <img class="crop-img d-block w-100 mx-auto" src="https://i.sstatic.net/0oBPS.jpg" alt="Second slide">
            <div class="carousel-caption">
                <h3>Strong mask</h3>
            </div>
        </div>
        <div class="carousel-item">
            <img class="crop-img d-block w-100 mx-auto" src="https://i.sstatic.net/0oBPS.jpg" alt="Third slide">
            <div class="carousel-caption">
                <h3>Slight mask</h3>
            </div>
        </div>
    </div>
    <!--Controls-->
    <a class="carousel-control-prev" href="#carousel-home" role="button" data-slide="prev">
        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
        <span class="sr-only">Previous</span>
    </a>
    <a class="carousel-control-next" href="#carousel-home" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>
</div>

Answer №2

To ensure the functionality of object-fit: cover, make sure that both the width: 100% and height: 100% properties are applied to the image element.

Additionally, remember to add overflow: hidden to the parent element of the image in order for it to work properly. Without setting the width and height for the image, the object-fit property will not take effect.

Just setting max-width and max-height on the image itself will not suffice, so be mindful of this when implementing the styling.

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