我如何让我的CSS网格居中？

.grid-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.grid-container {
  display: grid;
  justify-items: center;
  align-items: center;
}

.grid-container {
  position: relative;
}

.grid-item {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}