Elevated Positioning of Footer in Bootstrap

Hello, thank you in advance for any help offered. The website in question can be accessed through this link: caulfield.co/test/

I am working on implementing a parallax footer reveal effect using Bootstrap 4. I am having difficulty adjusting the z-index of the fixed-bottom footer to ensure it is hidden behind the body div and only revealed after scrolling to the bottom. Despite trying to modify the z-index property, nothing seems to change. I suspect that there may be something in the CSS of Bootstrap causing this issue, but I am unsure where to begin looking. Can someone provide assistance?

CSS:

.body-temp{
  height:1000px;
  margin-bottom:300px;
  background-color:black;
  z-index:5000;
}


/* Footer
-------------------------------------------------- */

footer{
  height:300px;
  background-color:#232323;
  margin: 0 auto;
  text-align:center;
  font-weight:300;
  font-size:.8rem;
  color:#666666;
  z-index: -1000;
}

HTML:

<div class="container body-temp">
  </div>


  <!-- Footer -->
      <footer class="container-fluid fixed-bottom">
        <a class="" href="#">
          <img class="grow" id="footer-logo" src="images/mb-white.svg" alt="Margaret Biggs Fine Art">
        </a>
        <p>&copy; 2018 Margaret Biggs</p>
        <div>
          <a class="footer-icons" href="#">
              <i class="fab fa-linkedin-in"></i>
          </a>
          <a  class="footer-icons" href="#">
              <i class="fab fa-facebook-f"></i>
          </a>
        </div>
      </footer>
csstwitter-bootstrapbootstrap-4z-indexfooter

Answer №1

Indeed, this is a case of Bootstrap overriding your CSS due to specificity.

You included the Bootstrap class fixed-bottom, which has a z-index of 1030.

The selector footer will not be able to override it.

To override Bootstrap using specificity, utilize footer.fixed-bottom.

In regards to body-temp, it currently has a position: static, which does not interact correctly with z-index. To rectify this, include position: relative in your body-temp styles.

Check out the MDN DOCS on z-index for more information.

"For a positioned box (that is, one with any position other than static), the z-index property specifies: ..."

I hope this explanation proves helpful :)

Answer №2

The easiest way to address this issue is by adjusting the position of the .body-temp element as shown:

.body-temp {
    position: relative;
}

In addition to that, I recommend enclosing the entire .body-temp element within a wrapper and setting the background color for the wrapper element:

HTML

<div class="body-wrapper">
    <div class="container body-temp"></div>
</div>
<footer class="container-fluid fixed-bottom">
    <a class="" href="#">
        <img class="grow" id="footer-logo" src="images/mb-white.svg" alt="Margaret Biggs Fine Art">
    </a>
    <p>© 2018 Margaret Biggs</p>
    <div>
        <a class="footer-icons" href="#">
            <i class="fab fa-linkedin-in"></i>
        </a>
        <a class="footer-icons" href="#">
            <i class="fab fa-facebook-f"></i>
        </a>
    </div>
</footer>

CSS

.body-wrapper {
    position: relative;
    z-index: 5000;
    background-color: #fff;
}

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