css grid center elements inside div

1.parent-element {
2   display: grid;
3   place-items: center;
4}

1article {
2  display: inline-grid;
3  grid-template-rows: 100px 100px 100px;
4  grid-template-columns: 100px 100px 100px;
5  grid-gap: 3px;
6}
7
8section {
9  display: flex;
10  justify-content: center;
11  align-items: center;
12  border: 2px solid black;
13  font-size: 3em;
14}