CSS - 4 columns grid properties

Question

.grid-container {
  display: grid;
  grid-template-columns: auto auto auto auto;
  grid-gap: 10px;
  background-color: red;
  padding: 10px;
}

.grid-container > div {
  background-color: blue;
  text-align: center;
  padding: 20px;
  font-size: 15px;
}