JSFiddle - React, Tailwind, and code Playground

HTML

<div id="cont">
    <div id="social">Sociales</div>
    <div id="busca">buscador</div>
    <div id="rss">RSS</div>
    
   
</div>

CSS

#cont{
width:100%;
    border:1px solid blue;
    overflow:hidden;
    position:relative;
}

#busca{
width:250px;
height:50px;
float:right;
background:green;}

#social{
width:100px;
height:200px;
float:left;
background:LightCyan;
}

#rss{
    width:250px;
    height:100px;
 position:absolute;
    right:0px;
    bottom:0px;
 
 background:#ff4500;
}