JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
  
  
  <div id="div1">
  <img src="http://externalapp.websoftghana.com/clean/decoupes/4000.jpg">
  </div>
  
  
  
</div>

<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>

CSS

#div1 {
    left: 300px;
    height: calc(100% - 197px);
    border: 1px solid black;
    background-color: yellow;
    float:left;
    overflow:hidden;
}
#div1 img{
  height:auto;
}
.wrap{
  height:100vh;
}