In this example I am creating a four column track grid, the tracks have absolute sizes and in total are smaller than the area of the grid container. Therefore we can align the grid inside the container - the default being start on both dimensions.

Credit to gridbyexample.com for inspiring this example.

[fl_row] {
    display: grid;
    grid-gap: 10px;
    border:solid;
    height:375px;
    width:450px;
    grid-template-columns: repeat(4, 80px);
    grid-template-rows: repeat(3,100px);
    justify-content: center;
    align-content: end;
}
[fl_row] .item1 {
    grid-column: 1 / 5;
}
[fl_row] .item2 {
    grid-column: 1 / 3;
    grid-row: 2 / 4;
}
[fl_row] .item3 {
    grid-column: 3 / 5;
}

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