Bootstrap 4 Vertically align footer while respecting columns and rows - css

Question

I'm trying to find a solution how to vertically align the 2 rows in the footer which are placed with a Bootstrap grid.
I've already tried to make a wrapper for the content and apply the regular flexbox solution:
display: flex; align-items: center. But this moves both rows to be on the same row.
Fiddle here https://codepen.io/pen/WNNPdxv
HTML
<footer class="footer">
<div class="footer-wrapper">
<div class="container">
<div class="row row">
<div class="col-sm-8 footer-credit">
<h6>GetMove</h6>
<p>Copyright &copy 2019 GetMove All Rights Reserved</p>
</div>
<div class="col-sm-2 footer-contact">
<h6>Contact</h6>
hola#getmove.net
</div>
<div class="col-sm-2 footer-social-icons">
<h6>Follow us</h6>
<a class="social-icon" target="_blank" href="https://www.facebook.com/pg/GetMove.Official/"
><i class="fab fa-facebook-square"></i
></a>
<a class="social-icon" target="_blank" href="https://www.instagram.com/getmovemx/"
><i class="fab fa-instagram"></i
></a>
<a class="social-icon" target="_blank" href="https://soundcloud.com/getmove"
><i class="fab fa-soundcloud"></i
></a>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-sm-8 text-center"></div>
<div class="col-sm-4 footer-newsletter">
<h6>Subscribe</h6>
<div class="input-group input-group-sm mb-3">
<input
type="text"
class="form-control shadow-none"
id="subscribe"
placeholder="# Enter your email adress"
aria-label="Sizing example input"
aria-describedby="inputGroup-sizing-sm"
/>
<div class="input-group-append">
<button class="btn btn-outline-secondary" type="button" id="button-addon1">
Submit
</button>
</div>
</div>
</div>
</div>
</div>
<div class="container footer-credit">
<div class="row">
<div class="col-sm-8"></div>
<div class="col-sm-4 footer-credit"></div>
</div>
</div>
</div>
</footer>
CSS
.footer {
width: 100%;
height: 24em; /* Set the fixed height of the footer here */
background-color: #f4f2f0;
margin-top: 4em;
}
.footer-social-icons {
list-style-type: none;
}
.footer h6 {
text-transform: uppercase;
font-size: 16px;
}
.footer-credit {
font-size: 11px;
}
.social-icon {
/* display: block; */
margin: 0;
font-size: 16px;
}
.form-control:focus {
border-color: black;
}

Answer 1

The idea of a wrapper to vertically center content is correct, however you already have a wrapper in place => container.
No need to have multiple containers inside a single section (footer). You use rows for this.
So to clean-up your structure a bit, as suggested in the comments, is key to understand what's going on.
container is your wrapper
row row is redundant
empty columns as placeholder are not required with flexbox (bootstrap 4), not sure if that's what's going on... => m-auto, ml-auto, mr-auto
place custom classes inside columns (these blocks might change places someday, especially when designing for a CMS)
keep the structure clean and decorate with utility classes if needed (padding, margin, ...)
HTML Structure
<footer role="contentinfo">
<div class="container">
<div class="row">
<div class="col-sm-7"></div>
<div class="col-sm-3"></div>
<div class="col-sm-2"></div>
</div>
<div class="row">
<div class="col-sm-5 ml-auto"></div>
</div>
<div class="row">
<div class="col-sm-5 ml-auto"></div>
</div>
</div>
</footer>
Solution
Now your height is set on the footer, your container is simply taking the required height inside the space. This means you should now be able to move it vertically with flexbox.
footer[role="contentinfo"] {
display: flex;
flex-flow: column wrap;
justify-content: center; /* content of the footer is the container */
}
DEMO