Set border-left to 1px solid crimson; in HTML and CSS
border-style | Codrops
html - CSS - left border of button is rounded on the right side - Stack Overflow
CSS Border Left | Learn the Working of CSS Border Left with Examples
Box model
Wes Bos on Twitter: "🔥 You can use new CSS logical properties instead of top/bottom/left/right. Makes designing multi-language websites much easier when the flow direction changes. CSS Grid and Flexbox already setup