Box alignment justify-self minmax() and spanning columns and rows

In this example, I am creating a grid that contains as many 200 pixel column tracks as will fit into the container with the remaining space shared equally between the columns. In the minmax() function the first value is the minimum size I want my tracks to be, the second is the maximum. By using 1fr as the maximum value, the space is equally distributed.

Credit to gridbyexample.com for inspiring this example.

[fl_row] {
    display: grid;
    grid-gap: 10px;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

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