Buttons: Darkbg

<div class="ucla campus">
    <!-- Primary Dark Background -->
    <button class="btn btn--darkbg">
        <span>Primary Dark Background Btn</span>
    </button>
</div>
<div class="ucla campus">
    <!-- Primary Dark Background -->
    <a class="btn btn--darkbg" href="#">
        Primary Dark Background Btn
    </a>
</div>