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

CSS Flexbox Explained – Complete Guide to Flexible Containers and

html - Equal height rows in a flex container - Stack Overflow

How to Make the First Flex Item Full Width - CSS Flexbox Tutorial

Controlling ratios of flex items along the main axis - CSS

CSS Flexbox Explained – Complete Guide to Flexible Containers and Flex Items

What Is the HTML Flexbox and How Do You Get Started Using It?

css - First-child full-width in Flexbox - Stack Overflow

css-align] behaviour for width or flex-basis of flex items when

CSS Gap creates a bright future for margins in Flex as well as

/assets/flex-css/flex-grow-2.png

How to make Flexbox items the same size using CSS ? - GeeksforGeeks