How to Vertically Middle-Align Floated Elements with Flexbox
html - Flexbox: center horizontally and vertically - Stack Overflow
html - Flexbox: center horizontally and vertically - Stack Overflow
css - Problem with flex-box vertical align middle (align-items: center) - Stack Overflow
align-items | CSS-Tricks - CSS-Tricks
html - How to nest content inside a flex box 'holy grail' layout? - Stack Overflow
Aligning items in a flex container - CSS: Cascading Style Sheets | MDN
Common CSS Flexbox Layout Patterns with Example Code | Tobias Ahlin
Center elements with flexbox | Webflow University
Aligning items in a flex container - CSS: Cascading Style Sheets | MDN
How to Center in CSS with Flexbox
Adam Wathan on Twitter: "Then it's just a matter of using flexbox in the column direction for each outside card to make sure the bottom chunk stretches to fill the available space (
html - Centering a specific element among others with flexbox - Stack Overflow