JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
  <div class="phone">
      <div class="panel">
      </div>
  </div>
</div>

CSS

.phone{
    width: 390px;
    height: 800px;
    padding-top: 100px;
    margin: auto;
    
    background: lightBlue;
}
.panel{
    width: 300px;
    height: 530px;
    
    padding-top: 100px;
    background: lightGray;
}