JSFiddle - React, Tailwind, and code Playground

HTML

<div id="one"> one </div>
<div id="two">
    sdfwwvw 
</div>

CSS

html{
  height: 100%;
}

body{
  min-height: 100%;
  margin:0;
  padding:0; 
  background: yellow;
}

body, #two{
  display: -ms-flexbox;    
  display: -webkit-box;    
  display: -webkit-flexbox;
  display: -webkit-flex; 
  display: flex;     
    -webkit-box-orient: vertical;    
      -moz-box-orient: vertical;    
     box-orient: vertical;    
  -webkit-flex-direction: column;
     -moz-flex-direction: column;
    -ms-flex-direction: column;
     flex-direction: column;     
}

#two{
    background: pink;
    width: 100%;
    min-height: 100%;
    width: 100%;
    -webkit-box-flex: 10;
    -moz-box-flex: 10;  
    -webkit-flex: auto; 
    -moz-flex: auto;
    -ms-flex: auto;
    flex: 1 1 auto;     
}