Flexbox capability
html - Flexbox: center horizontally and vertically - Stack Overflow
Align Items In CSS align-items flex-start, flex-end, center, baseline.
Align items and justify content - Create Web Page Layouts With CSS - OpenClassrooms
How to Use Flex to Align HTML Elements
How to align flexbox columns left and right using CSS ? - GeeksforGeeks
CSS Flex: What Every Developer Should Know
CSS Flexbox: A Complete Guide
align-items in CSS Flexbox – How to Layout Flex Children
Flexbox Dynamic Line Separator