One
Two
Three
.box { display: flex; } .box > * { width: 200px; } .one { flex: 1 1 auto; } .two { flex: 1 0 auto; } .three { flex: 2 4 auto; }
<div class="box"> <div class="one">One</div> <div class="two">Two</div> <div class="three">Three</div> </div>