How to Prevent Double Borders in CSS When Using Adjacent Divs?

Preventing Double Borders in CSS

For two adjacent divs with borders, it may appear like there's a double border where they meet. To resolve this, consider the following:

Using an Outline Instead of a Border

• Replace the border with an outline for each div:

<code class="css">.collection .child {
    outline: 1px solid;
}</code>

• Add positive margins to compensate for the extra width created by the outline:

<code class="css">.collection .child {
    outline: 1px solid;
    margin-top: 1px;
    margin-left: 1px;
}</code>

Using Negative Margins with Borders

Alternatively, you can keep the borders and use negative margins to reduce the overlap:

<code class="css">.collection .child {
    margin-top: -1px;
    margin-left: -1px;
}</code>

Note that this option may not be suitable for all scenarios, especially if the divs have variable heights or widths.

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