JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <header>
  </header>

  <article>
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   ...

CSS

header {
    min-height: 255px;
}
article {
    padding-bottom: 60px; 
    width: 900px; 
    margin: 0 auto;
}
footer {
    position: fixed; 
    bottom: 0px; 
    width: 100%; 
    height: 60px; 
    background-color: black;
}