Suma - styl CSS

body {
  margin: 20px 100px;
  font-size: 2rem;
}
input {
  font-size: 2rem;
}
div {
  border: 5px double red;
  margin: 25px auto;
  padding: 25px;
}
a {
  display: inline-block;
  text-decoration: none;
  padding: 3px;
  border: 1px solid black;
  background-color: lightgray;
  font-family: arial;
  color: black;
}
a:hover {
  background-color: gray;
}

  $kodphp =<<<'KODCSS'
    ... tu skopiowano kod z pliku style.css
  KODCSS;
  echo '<div><pre>' . htmlspecialchars($styl) . '</pre></div>';