Tratando a ferida
<!DOCTYPE html>
<html lang="pt-br">
<head>
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Precauções com a ferida</title>
   <link rel="shortcut icon" href="imagens/favicon-16x16.png" type="image/x-icon">
   <link rel="stylesheet" href="css/style.css">
</head>
<body>
   <header>
      <h1>Cuidando da ferida</h1>
   </header>
   <main>
      <iframe width="560" height="315" src="https://www.youtube.com/embed/mCqFXSp8HB8" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen id="centralizar" controls></iframe>
   </main>
</body>
</html>
@charset "UTF-8";

body {
   font-family: Arial, Helvetica, sans-serif;
   font-size: 1.5rem;
   background-color: #000000df;
}
 
h1 {
   text-align: center;
   color: white;
}

iframe#centralizar {
   width: 700px;
   height: 400px;
   position: absolute;
   top: 0;
   bottom: 0;
   left: 0;
   right: 0;
   margin: 6em auto;
}
/* ESLint rules https://eslint.org/docs/2.0.0/rules/ */
/* eslint no-undef: "off" */

Tratando a ferida

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