Grid

place-content

justify-content => Horizontal Axis Align
align-content => Vertical Axis Align

place-content: <align-content> <justify-content>

CSS
.container {
  display: grid;
  height: 800px;
  grid-template: repeat(3, 200px) / repeat(3, 200px);
  place-content: start center;
}
Box-1
Box-2
Box-3
Box-4
Box-5
Box-6
Box-7
Box-8
Box-9
CSS
.container {
  display: grid;
  height: 800px;
  grid-template: repeat(3, 200px) / repeat(3, 200px);
  place-content: center end;
}
Box-1
Box-2
Box-3
Box-4
Box-5
Box-6
Box-7
Box-8
Box-9
CSS
.container {
  display: grid;
  height: 800px;
  grid-template: repeat(3, 200px) / repeat(3, 200px);
  place-content: center;
}
Box-1
Box-2
Box-3
Box-4
Box-5
Box-6
Box-7
Box-8
Box-9