How to Extend Grid Navigation Across the Entire Website Width

The Anatomy of Your Grid

You've encountered an issue where your navigation (nav) doesn't stretch across the entire width of your website, despite specifying the columns you want it to occupy. To understand the problem, let's break down the syntax you've used:

<code class="css">grid-column: 1 / 2;</code>

This notation defines the starting and ending points of the grid column, breaking down to:

<code class="css">grid-column-start: 1;
grid-column-end: 2;</code>

In this case, it tells the navigation (nav) to extend from the first grid column line to the second grid column line. However, there's a discrepancy:

Your grid actually has three column lines, not two.

Grid Line Counting: Start and End Lines

In a grid system, the number of column/row lines is always equal to the number of columns/rows plus one. This extra line indicates the end of the grid.

Adjusting Your Grid Specification

To fix this issue, you can adjust your grid specification to span across all columns:

Option 1: Specify the End Column

<code class="css">grid-column: 1 / 3;</code>

Option 2: Use Negative Values

<code class="css">grid-column: 1 / -1;</code>

Negative values count from the end of the grid, so "-1" represents the last column line.

Making the Change

Replace your original grid-column rule with either of the above options:

<code class="css">.mainnav {
  grid-column: 1 / -1;
}</code>

This change will allow your navigation (nav) to stretch across the entire width of your website.

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