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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel=”stylesheet” href=”estilos.css”.css type="text/css">
<title>adsdaas</title>
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<body>
<h1="h1"> colocacion de recuadro </h1>
<p id="p1">1</p>
<p id="p2">2</p>
<p id="p3">3</p>
<p id="p4">4</p>
</body>
</html>
h1 { font-family: "Courier";
background-color: rgb(209, 255, 205);
color: red;
font-size: "25px"; }
p{ font-family: "Arial, Helvetica, sans-serif";
background-color: aqua;
color: coral;
font-size: 15px;
}
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<link rel=”stylesheet” href=”estilos.css” type="text/css">