JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div>
    1
  </div>
  <div>
    2
  </div>  
  <div class="right">
    3
  </div>  
</div>

CSS

.container{
  border:1px solid red;
  display:flex;
  justify-content:flex-start;
  width:100%;
  height: 200px;
  flex-direction:row;
}
.container div{
  border:1px solid blue;
  height: 100px;
  width: 100px;
}

.right{
  display:flex;
  align-self:flex-end;
}