<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>Basic document flow</title>

    <style>
      body {
        width: 500px;
        margin: 0 auto;
      }

      p {
        background: aqua;
        border: 3px solid blue;
        padding: 10px;
        margin: 10px;
      }

      span {
        background: red;
        border: 1px solid black;
      }
    </style>
  </head>
  <body>
    <h1>Basic document flow</h1