How Can I Make Flex Items Expand Proportionally Based on Their Original Sizes?

Expanding Flex Items Proportionally to Their Original Size

To ensure that flex items expand uniformly while maintaining their relative widths, adjust from flex: 1 to flex: auto. This switch alters the sizing calculation, factoring in the content size.

Understanding Flex-grow and Flex-basis

Flex-grow, as the name suggests, increases the size of an item based on its defined value and available free space. However, it’s important to consider the role of flex-basis, which determines the initial size of an item.

Relative vs. Absolute Sizing

When flex-basis is set to 0, flex-grow treats all space as free space for distribution, resulting in absolute sizing where items are equal in width regardless of content.

Conversely, if flex-basis is auto (the default), the content size is considered before calculating free space. This enables relative sizing, where only extra space is distributed proportionally.

Breakdowns of Flex Values

• flex: 1: Shorthand for flex-grow: 1 (absolute sizing)
• flex-grow: 1: Relative sizing, factoring in both content size and available space
• flex: auto: Equivalent to flex-grow: 1 / flex-shrink: 1 / flex-basis: auto, which is also relative sizing

By employing flex: auto, the buttons will increase in size to fill the remaining width of the row while preserving their original size ratio. This will ensure that the widest button remains wider than the others, even when expanded.

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