JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.0.min.js"></script>
<!-- Note: This is the structure of the page, tooltip information should only be
           appended to the tooltip-container -->
<div id="tooltip-container"></div>
<div class="text-container">
  <p>
  <strong>Lorem ipsum dolor sit amet, (im on top my tooltip should go below)
  consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.  
  </strong>
  </p>
  <p>
  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
  </p>
  <p>
  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
  </p>
  <p>
  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in...

CSS

#tooltip-container {
  position:absolute;
  background-color:#fff;
  border: 1px solid;
  border-radius:0.4em;
}

JavaScript

//Issues found, the tooltip on mouse over on the text at bottom of the page are overflowing.
var $tooltipContainer = $("#tooltip-container"),
		posScrollX = 0,
    posSrollY = 10;
$(document).ready(function(){
  $("strong").on("mouseover", function(){
		var $this = $(this),
    		strongText = $this.text();
    $tooltipContainer.show();
    $tooltipContainer.append('<span>'+ strongText + '</span>');
    //condition here if tooltip container is outside the screen
    /*
     * change the posScrollX and/or posSrollY 
     * to make the position of the container visible on the screen
     */
  }).on("mousemove", function(mousePos){
  	$tooltipContainer.css({
			left: mousePos.pageX,
      top: mousePos.pageY + posSrollY
    });
  }).on("mouseleave", function(){
  	$tooltipContainer.hide();
    $tooltipContainer.find("span").remove();
  });
});