Force CSS grid container to fill full screen of device

Detailed steps

Here's the detailed steps to achieve a full-screen CSS grid. Look through the "Reddit-style" comments in the code below for helpful and humorous tips.

* { /* This is it. The Thanos Snap! */
  box-sizing: border-box; /* Boxing champ */
  padding: 0; /* The ultimate tummy tuck */
  margin: 0; /* No room for any margin-al error ;) */
}

html, body {
  width: 100%; /* Snowballing the full width */
  height: 100%; /* Maximizing the height */
  overflow: auto; /* Excess baggage? No problem! */
}

.grid-container {
  display: grid; /* Let the grid games begin */
  position: fixed; /* I ain't moving, bro! */
  top: 0; /* Riding high */
  left: 0; /* A leftie's dream */
  right: 0; /* Right on point */
  bottom: 0; /* Hitting a(nother) bottom */
  grid-template-columns: repeat(3, 1fr); /* Thrice the nice */
  grid-gap: 10px; /* Mind the gap, please */
}
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Advanced grid tips and tricks

Keep it responsive

fr units are your best friends for a responsive structure. Fine-tune with media queries as needed.

Borders and gaps

Borders can help visualize your grid, but they do take up space. Make sure to accommodate them in your column widths and mind the gap!

Positioning essentials

position: absolute; provides nuanced control, but for a top layer grid, go for position: fixed;.

Legacy browser support

Remember your old friends. Use flexbox or percentages for graceful fallbacks in older browsers that don’t support viewport units or CSS Grid.

Time to fine-tune

Global reset

Use the * selector for a global reset. This will clear all margins and padding, and set box-sizing: border-box; for universal sizing.

The power of min-height

Swap height: 100vh; for min-height: 100vh;. This provides flexibility for your content to grow beyond the screen size.

Viewport and grid harmony

For full-screen, responsive designs, combine vh units with grid-template-rows.

Positioning for full coverage

With position: fixed;, set all edges to 0 for a spot-on full-screen experience.

A border-style debug

A colored border can help you debug your grid layout. This can be especially handy when checking for unwanted overflow or gaps.