css - 100% total width for flex items in flex container, with gap

I am trying to position elements in a flexbox with flex-wrap with gap in between Ideally the way this should be displayed is: On the first row the blue box taking the full width no gaps anywhere S

Calculate the Percentage Width of Flex Items When Using Gap

/assets/flex-css/flex-grow-1.png

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css - How to create a 100% width and height Flex container with

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/assets/flex-css/flex-grow-5.png

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