Side menu with minimum width

I want to create a side menu of minimal width next to the content.

• Using [Flexbox
• If you do not specify a width for the menu, it will be just about the size of the contents.
  • By default, flex-basis: auto
• Specify flex-grow on the content side.
  • Default is 0
  • This will result in "no menu growth, only content growth.
• I didn't want the menu side to be too tight with that, so I specified padding.
• I added something like width: 20% with my old knowledge before flexbox, but it wasn't necessary. html

<div style="display: flex">
  <div style="background: green; flex-grow: 1">
    contents
  </div>
  <div style="background: red; padding: 2px">
    menu
  </div>
</div> 

CodePen

pRegroup-done

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