calc Grid

row & column 

<section>
  <div>

    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>

  </div>
</section>

section
  row()

.block
  column(1/4)

offset 

<section>
  <div>

    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>

  </div>
</section>

section
  row()

.block
  column(1/4)
  &:nth-child(2)
    offset(1/4)

shift 

<section>
  <div>

    <div class="block">1</div>
    <div class="block">2</div>

  </div>
</section>

section
  row()

.block
  column(1/2)
  &:nth-child(1)
    shift(1/2)
  &:nth-child(2)
    shift(-1/2)
1
2