Use .flex-row to make the flex items appear side by side (default).
Use .flex-row-reverse to right-align the direction, and use .flex-sm|md|lg|xl-row-reverse to right-align the direction on a specific screen size. Resize the browser window to see the effect.
flex-row-reverse:
flex-sm-row-reverse:
flex-md-row-reverse:
flex-lg-row-reverse:
flex-xl-row-reverse: