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Use Flexbox for a simple row of two DIVs
For two adjacent boxes with different amounts of content, make their shared parent a flex container. In a row, flex items stretch across the cross axis by default; align-items: stretch makes that behavior explicit.
<div class="columns">
<div class="column">Shorter content</div>
<div class="column">Longer content<br>More content</div>
</div>.columns {
display: flex;
gap: 1rem;
align-items: stretch;
}
.column {
flex: 1;
}The longer column determines the row height, and the shorter column stretches to match it. The items need to be siblings in the same flex row; setting separate heights on the DIVs is not necessary.
Choose Grid for a row-and-column or wrapping card layout
Grid is a natural choice when the design is organized in rows and columns or when cards need to wrap as the available width changes. Items in the same grid row stretch to fill that row’s track, whose height is determined by its content. MDN describes Flexbox as suited to one-dimensional layouts and Grid for two-dimensional layouts and card arrangements: Grid layout: basic concepts and Relationship of flexbox to other layout methods.
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.columns {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 1rem;
}This creates two equal-width columns; items in each row share that row’s height. Use Flexbox when the main need is a single row with alignment and spacing control, and Grid when the surrounding layout is naturally a grid or needs row-based card wrapping.
Use CSS table cells only when table-like sizing fits
A shared parent with display: table and sibling elements with display: table-cell can also make adjacent boxes match heights. This approach was suggested in the original SitePoint discussion. Prefer Flexbox or Grid when you need their alignment, spacing, or responsive layout controls; table-cell display is an alternative when its table-like sizing behavior suits the design.
Fix a one-pixel height mismatch by checking the children
If the boxes look one pixel different, inspect the exact elements whose backgrounds show the edges, along with child borders, padding, margins, and box sizing. The original SitePoint poster found that the apparent discrepancy came from a 1px white bottom border on the last advertising-text item; a reply suggested removing it with:
.abs_top_items:last-child {
border-bottom: none;
}Check those details before adding fixed heights or adjusting margins by hand. A child border can make two equal-height parent boxes appear uneven.
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What to expect across browsers
The SitePoint thread includes a question about cross-browser behavior and a concern about an Internet Explorer margin-and-padding workaround, but it does not establish a browser-version compatibility matrix. Check the layout against the browser versions your site supports rather than treating that thread as a guarantee for legacy browsers.
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