<div class="parent">
  <div class="child">a</div>
  <div class="child">b</div>
  <div class="child">c</div>
  <div class="child">d</div>
  <div class="child">e</div>
  <div class="child">f</div>
  <div class="child">g</div>
</div>

.parent {
  margin: 20px auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr 1fr;
}

.child {
  min-height: 100px;
  background: orange;
  border: 5px solid white;
  line-height: 100px;
  text-align: center;
}