JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main">
   main 
     <div class="tabs">
         tabs
     </div>  <!-- Closing div for .tabs -->
 </div>  <!-- Closing div for .main -->

CSS

.tabs{
    position: fixed;
    width:40px;
    background: blue;
    color: white;
}
.main{
    position: absolute;
    top: 100px;
    left: 100px;
    background: red;
    color: white;
}

JavaScript

$(function(){
    var t = $('.main').position().top;
    var l = $('.main').position().left;
    $('.tabs').css('top', t + 100).css('left', l + 100);
});