ustify-contenido: flex-end
<div class="d-flex justify-content-end">...</div>
flex wrap bootstrap
<div class="d-flex flex-wrap">...</div>
pantalla de arranque flex
<div class="d-flex">I'm a flexbox container!</div>
pantalla flex usnig bootstrap
<div class="d-flex p-2 bd-highlight">I'm a flexbox container!</div>