<div class="grid-container">
  <div style="width:100px;height:100px;background:blue">1</div>
  <div style="width:100px;height:100px;background:blue">2</div>
  <div style="width:100px;height:100px;background:blue">3</div>
</div>

.grid-container {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  background-color: blueviolet;
}

.grid-container div:nth-child(3n + 1) {
  justify-self: start;
  background-color: rgb(253, 228, 0);
}

.grid-container div:nth-child(3n + 2) {
  justify-self: center;
}

.grid-container div:nth-child(3n + 3) {
  justify-self: end;
}