Why does a grid with 100% grid-template-columns extend beyond the body when using fixed positioning?

Grid Exceeds Body with 100% Grid-Template-Columns

Why does a display grid with 100% in grid-template-columns extend beyond the body when position is set to fixed?

Problem:

Consider the following CSS and HTML:

.parent {<br>  position:fixed;<br>  width:100%;<br>  left:0;<br>  top:14px;<br>  display:grid;<br>  grid-template-columns:40% 60%;<br>  grid-gap:5px;<br>  background:#eee;<br>}<br>.left {<br>  border:2px solid red;<br>}<br>.right {<br>  border:2px solid red;<br>}

<div class='parent'><br>  <div class='left'>LEFT</div><br>  <div class='right'>RIGHT</div><br></div>

When position is not fixed, the grid displays correctly. However, when position is set to fixed, the grid extends beyond the body on the right side.

Solution:

The issue lies not with the 100% width but with the grid-template-columns property. Using percentages and a fixed grid-gap will exceed 100% of the available space.

Instead, rely on the fr unit to distribute the free space proportionally, taking into consideration the grid gap:

.parent {<br>  position:fixed;<br>  width:100%;<br>  left:0;<br>  top:14px;<br>  display:grid;<br>  grid-template-columns:4fr 6fr;<br>  grid-gap:5px;<br>  background:#eee;<br>}<br>.left {<br>  border:2px solid red;<br>}<br>.right {<br>  border:2px solid red;<br>}

<div class='parent'><br>  <div class='left'>LEFT</div><br>  <div class='right'>RIGHT</div><br></div>

By using fr units, the grid will now distribute the space correctly, ensuring that it remains within the bounds of the body.

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