How to Achieve Exact Equal Column Widths in CSS Grid?

Exact Equal Column Widths in CSS Grid

Creating equally sized columns in CSS Grid may seem straightforward, but it requires a specific approach. While Flexbox offers an easy solution with its flex-basis property, CSS Grid necessitates a more precise configuration.

Challenge:

Given an HTML structure like:

<code class="html"><div class="row">
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
</div></code>

The goal is to display these elements in equal columns, regardless of the number of child elements within the row.

Solution:

The common approach of repeat(3, 1fr) is insufficient, as 1fr distributes available space rather than enforcing strict column equality. In cases where content exceeds the track size, it does not automatically adjust, potentially resulting in uneven column widths.

To achieve exact equal column widths, use the following CSS property:

<code class="css">grid-template-columns: repeat(3, minmax(0, 1fr));</code>

Explanation:

minmax(0, 1fr) allows the grid tracks to be as small as 0 but as large as 1fr. This ensures that the columns remain equal. However, be cautious, as it can cause overflows if the content is larger than the column or if it cannot be wrapped.

Consider the following example to illustrate the difference:

<code class="css">.equalColumns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.minmaxEqualColumns {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}</code>

equalColumns with repeat(3, 1fr):

minmaxEqualColumns with repeat(3, minmax(0, 1fr)):

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