How to Avoid Double Borders in CSS Grid Layouts?

Preventing Double Borders in CSS Grid

Problem:

In a CSS grid layout, how can we eliminate double borders between grid items? This is common when using borders on both the grid container and its child elements.

Answer:

Collapse Borders with Grid Properties

To avoid double borders, consider replacing the border on grid items with alternate techniques using CSS grid properties:

1. Use Container Background Color:

Instead of a border on grid items, apply the "border" color as the background color of the container.

CSS:

.wrapper {
  display: inline-grid;
  grid-template-columns: 50px 50px 50px 50px;
  border: 1px solid black;  // Define "border" color
  grid-gap: 1px;            // Set "border" width
  background-color: black; // Replaces border on grid items
}

2. Use Grid Gaps:

The grid-gap property creates spacing between grid items, effectively mimicing a "border" width. Set the gap to the desired border width.

CSS:

.wrapper {
  display: inline-grid;
  grid-template-columns: 50px 50px 50px 50px;
  grid-gap: 1px; // Set "border" width
}

.wrapper > div {
  background-color: white; // No border on grid items
}

HTML:

<div class="wrapper">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
</div>

By utilizing these techniques, you can prevent double borders in CSS grid layouts and achieve a clean and unified appearance.

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