JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">     
    <aside> 
    sb   
    </aside>
    
    <div id="content">
   	<div class="dummy-height">
    dummy
    </div>
	</div> 
</div>

CSS

html{
          min-height:100%;	
      }
      body{
          min-height:100%;
          background-color:#eee;
      }
      #container{
      	  background-color:#ccc;
      }	
      aside{
          position:absolute;
          width:260px;
          float:left;
          background-color:#333;
          min-height:100%
      }
	#content{
		min-height:100%;
		margin-left:300px;
	}
    .dummy-height{
    	height:2000px;
        background-color:#777;
    }