How can I center a div with a specific width and height inside another div?

I've been working with bootstrap and have the following HTML code:

    <div class="row">
          <div class="col-md-3">
              <div class="a">
                  <p>a</p>
              </div>
          </div>
          <div class="col-md-3">
              <div class="b">
                  <p>b</p>
              </div>
          </div>
          <div class="col-md-3">
              <div class="c">
                  <p>c</p>
              </div>
          </div>
          <div class="col-md-3">
              <div class="d">
                  <p>d</p>
              </div>
          </div>
    </div>

In terms of CSS, I've defined different styles for each class (a, b, c, d) as shown below:

.a{
    background-image: url('a.jpg');
    width: 300px;
    height: 300px;
    margin-top: 5%;
    border-radius: 10px;
}

My challenge now is to center these div elements (class a, b, c, d) within each col-md-3 column. Any suggestions or solutions would be greatly appreciated.

Answer №1

To center an element horizontally, simply apply auto margins:

.element1, .element2 {
    margin: 0 auto;
}

If you want to center both horizontally and vertically, you can use flexbox on the parent elements:

.row-md-4 {
    display: flex;
    align-items: center;
    justify-content: center;
}

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