How Can I Use Flex-Basis to Make a Flex Item Span the Full Width?

Flex-Basis to Force Full-Width Element

In order to force the third element to span the full width below the first two flex items, we can utilize the flex-basis property.

By setting flex-basis: 100% on the third element, we instruct it to occupy the entire available space, effectively forcing it to span the full row width.

.error {
  flex: 0 0 100%; /* flex-grow, flex-shrink, flex-basis */
  border: 1px dashed black;
}

This ensures that the third item will always take up the remaining space, regardless of the sizes of the first two items.

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