Achieving perfect alignment for images within a Bootstrap 4 carousel - both vertically and horizontally

Utilizing Bootstrap 4 carousel, I am attempting to center an image both vertically and horizontally. Below is my code along with the styling that I have applied:

<div id="myCarousel" class="carousel slide" data-ride="carousel">
    <ul class="carousel-indicators">
        <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
        <li data-target="#myCarousel" data-slide-to="1"></li>
        <li data-target="#myCarousel" data-slide-to="2"></li>
    </ul>

    <div class="carousel-inner">
        <div class="carousel-item active">
            <img src="https://placehold.it/200x200/c0392b/000">                      
        </div>
    </div>

    <a class="carousel-control-prev" href="#myCarousel" 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="#myCarousel" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
    </a>
</div>



#myCarousel {
    height: 100%;
    width: 100%;    
}

.carousel-indicators {
    margin-bottom: 8px;
}

.carousel-indicators>li {
    width: 10px;
    height: 10px;
    border-radius: 100%;
}

.carousel-inner {
    height: 100%;
    background-color: #213B74;
}

.carousel-item {
    text-align: center;
}

.carousel-item img {
    display: block;
    margin: auto;
}

Currently, there is only one carousel item for testing purposes. The image is centered horizontally, but even after setting the display attribute of the image to block and its margin to auto, it remains uncentered vertically. Can someone please point out what error I may be making?

I have gone through similar questions, yet none have provided the solution I seek. If this question duplicates another, kindly direct me to the relevant answer.

Thank you.

htmlcssbootstrap-4carousel

Answer №1

To center your image within a carousel item, you need to nest a <div> inside the .carousel-item, where the image will be placed. This additional div serves as a mediator for applying the centering effect using flex.

If you attempt to apply flex classes like d-flex directly on the .carousel-item, the carousel functionality may not work properly.

In this solution, I included the 

<div class="parent d-flex justify-content-center">
which positions the image at the exact center of the div. You also need to assign a min-height equal to the height of the .carousel-item or specify a standard height for the carousel to prevent collapsing if the inner image is smaller.

You can learn more about flex properties here. For hands-on examples with flexbox, visit this link.

#myCarousel {
  height: 100%;
  width: 100%;
}

.carousel-indicators {
  margin-bottom: 8px;
}

.carousel-indicators>li {
  width: 10px;
  height: 10px;
  border-radius: 100%;
}

.carousel-inner {
  height: 100%;
  background-color: #213B74;
}

.carousel-item {
  text-align: center;
}

.parent {
  min-height: 200px;
}

.carousel-item img {
  display: block;
  margin: auto;
}
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

<div id="myCarousel" class="carousel slide" data-ride="carousel">
  <ul class="carousel-indicators">
    <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
    <li data-target="#myCarousel" data-slide-to="1"></li>
    <li data-target="#myCarousel" data-slide-to="2"></li>
  </ul>

  <div class="carousel-inner">
    <div class="carousel-item active">
      <div class="parent d-flex justify-content-center">
        <img src="https://placehold.it/100x200/c0392b/000">
      </div>
    </div>
    <div class="carousel-item">
      <div class="parent d-flex justify-content-center">
        <img src="https://placehold.it/200x100/c0392b/000">
      </div>
    </div>
    <div class="carousel-item">
      <div class="parent d-flex justify-content-center">
        <img src="https://placehold.it/150x150/c0392b/000">
      </div>
    </div>
  </div>

  <a class="carousel-control-prev" href="#myCarousel" 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="#myCarousel" 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

I successfully resolved your issue by implementing the following CSS code:

#myCarousel {
    height: 100vh;
    width: 100%;    
}

.carousel-indicators {
    margin-bottom: 8px;
}

.carousel-indicators>li {
    width: 10px;
    height: 10px;
    border-radius: 100%;
}

.carousel-inner {
    height: 100%;
    background-color: #213B74;
}

.carousel-item {
   height: 100%;
}

.carousel-item img {
   position: absolute;
   left: 50%;
   top: 50%;
   transform: translate(-50%, -50%)
}

To start, I set the carousel's height to 100vh to occupy the entire screen height. The carousel-item was then given a height of 100% to fill the full height of the carousel. Finally, the carousel-item img styling ensured the image is centered both horizontally and vertically within the carousel.

Answer №3

To implement this feature, you can utilize the Bootstrap 4 flex classes align-items-center and align-content-center. Here is an example:

.main-wrapper {
  width: 100%;
  height: 100vh;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>

<div class="main-wrapper">
  <div class="h-100 w-100 d-flex flex-wrap align-items-center align-content-center">
    <div class="mx-auto">

      Content

    </div>
  </div>
</div>

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