o-grid

Code
<div class="o-grid">
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
</div>

o-grid o-grid--continuous

Code
<div class="o-grid o-grid--continuous">
    <div class="o-grid__item o-grid__item--colspan-2"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
    <div class="o-grid__item"></div>
</div>