conceptos básicos de CSS
background-color: #ccc;
box-sizing: border-box;
font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
color: #00f;
padding: 20px;
font-size: 20px;
margin: 10px auto;
width: 600px;
text-align: justify;
text-shadow: 1px 1px 2px #000;
box-shadow: 0px -8px 10px red , 20px 20px red;
border-radius: 20px;
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