Oh yeah! That's actually an earlier version of the code. That version of the color palette is a bit buggy, but I've updated it to look somewhat nicer. You can check it out if you want! And I can only offer the color palette part, which you can insert into the code. Hopefully this helps!

<div class="row no-gutters mt-2">
<div class="col p-3" style="background-color: #333;"></div>
<div class="col p-3" style="background-color: #444;"></div>
<div class="col p-3" style="background-color: #555;"></div>
<div class="w-100 hidden-md-down"></div>
<div class="col p-3" style="background-color: #666;"></div>
<div class="col p-3" style="background-color: #777;"></div>
<div class="col p-3" style="background-color: #888;"></div>
</div>