How Can I Center Elements Only on the Last Row of a Responsive Grid Layout?

Centering Elements on the Last Row: CSS Grid vs. Flexbox

Dilemma:
When using CSS Grids to align items in an evenly spaced grid, how can you center elements on the final row alone while accommodating any number of items?

Not Suitable for CSS Grid:
CSS Grids are not ideal for aligning items across an entire row or column, as crisscrossing tracks hinder the desired effect.

Alternative: Flexbox
To achieve the desired centering, consider utilizing flexbox with justify-content: center. This will pack items horizontally in the center of the row, while margins push them apart.

Mechanics:
On full rows, justify-content has no effect, making the items fully justified with no free space. However, on rows with free space (i.e., the last row), the items will be centered.

Example:

CSS:

#container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.item {
  flex: 0 0 calc(16.66% - 20px);
  background: teal;
  color: white;
  padding: 20px;
  margin: 10px;
}

* {
  box-sizing: border-box;
}

HTML:

<div>

Result:
With this approach, items on the final row will be centered while the layout remains responsive to different counts of items.

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