How Can I Control Odd Flexbox Wrapping on the Last Line?

How to Control Flexbox Wrapping Behavior

The Problem

When creating responsive flexbox layouts, you may encounter instances where the last few items wrap oddly, leaving an excessive amount of space on the previous line. For example, in a grid of cards that dynamically renders based on API calls, you want the last two cards to wrap from the left side, ensuring they align with the preceding ones instead of centering.

The Solution

You can modify the flexbox wrapping behavior through CSS to achieve the desired alignment. Two common approaches include:

Using 'Ghost' Elements

Create 'ghost' elements with no visible content. These elements effectively fill out the last line, pushing subsequent cards to the next row. The number of 'ghost' elements corresponds to the intended column length.

For instance, for a potential column length of 4, you would require 3 'ghost' elements. Using CSS:

.card:empty {
    width: 300px;
    box-shadow: none;
    margin: 2rem;
    padding-bottom: 0;
}

Using the ::after Pseudo-Element

Alternatively, employ the CSS pseudo-element ::after. This approach diminishes the number of 'ghost' elements required.

.card::after {
    content: "";
    width: 100%;
    height: 100%;
    background-color: transparent;
}

This pseudo-element acts as a placeholder, filling out the remaining space on the last line.

By implementing either of these techniques, you can adjust the wrapping behavior of your flexbox layout, ensuring that the last items align appropriately, regardless of screen size or the number of rendered cards.

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