Flexbox

[libbyschuknight]

Use Flexbox for grid

• https://www.sitepoint.com/using-modern-css-to-build-a-responsive-image-grid/
  (https://codepen.io/SitePoint/pen/bEvVqP)
• https://flexbox.io/ (https://courses.wesbos.com/account/access/586bed364c6c2c61ebbbd98d)