How to Add a 1px Margin to Flex Items with `flex: 0 0 25%`?

Adding a 1px Margin to Flex Items with flex: 0 0 25%

When working with flex layouts, it may be desirable to add a small margin, such as 1px, to flex items. However, flexbox does not inherently allow for fractional values as margins.

For flex items defined using flex: 0 0 25%, adding a 1px margin directly is not possible. This is because the flex-basis is fixed to 25%, leaving no available space for a margin.

Solution:

To achieve a 1px margin in this scenario, leverage the flex-grow property:

flex: 1 0 22%;

• flex: 1: The flex-grow allows the element to expand beyond its specified flex-basis.
• 0: flex-shrink is set to 0 to ensure that the element will not shrink below its flex-basis.
• 22%: flex-basis is reduced to 22% to account for the desired 1px margin on each side (2/11 = 0.19% per side, which when added up to 22% results in 25%).

By reducing the flex-basis and increasing the flex-grow, the element will have the desired margin while still maintaining its defined proportions.

Example:

#foto-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  margin: 10px;
}

.foto {
  flex: 1 0 22%;
  min-height: 50px;
  margin: 1px;
  background-color: red;
}

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