Review Overall design and CSS strategy - implement FLEX

[x9t9]

After seeing #82 and #84 , I have decided to create a new issue that would potentially handle - and could be referenced from - all the other issues and / or improvements that can be handled or addressed with having a more stable and thoughtful overall design strategy , like moving to a flex CSS flex technique .
Feel free to reference all layout related issues here , contribute , or close this issue if deemed unnecessary .

• Use flexbox for new board form/colors (fixed in Archive boards #133)

[artemanufrij]

let close it.
it's a continuous process.