JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
  <p>Create a div that stretches across the window, with a 50px gap between both sides of the div and the edges of the window:</p>
  <div id="div1">Some text...</div>
</div>

CSS

#div1 {
     
    left: 300px;
    height: calc(100% - 197px);
	 
    border: 1px solid black;
    background-color: yellow;
    
}
.wrap{
  height:250px;
}