If you want to create a split screen layout, consider utilizing the Grid System from Bootstrap.
After implementing this approach, your code might look something like this:
https://i.sstatic.net/NF0OW.png
<div class="container">
<div class="row">
<div class="col">
<div class="card mb-4">
<img class="card-img-top img-fluid" src="https://via.placeholder.com/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">1 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
</div>
<div class="col">
<div class="card mb-4">
<img class="card-img-top img-fluid" src="https://via.placeholder.com/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">2 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
<div class="w-100 d-none d-sm-block d-md-none"><!-- wrap every 2 on sm--></div>
</div>
<div class="w-100"></div>
<div class="col">
<div class="card mb-4">
<img class="card-img-top img-fluid" src="https://via.placeholder.com/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">3 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
</div>
<div class="col">
<div class="w-100 d-none d-md-block d-lg-none"><!-- wrap every 3 on md--></div>
<div class="card mb-4">
<img class="card-img-top img-fluid" src="https://via.placeholder.com/500x280" alt="Card image cap">
<div class="card-body">
<h4 class="card-title">4 Card title</h4>
<p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
<p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
</div>
</div>
</div>
</div>
</div>