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padding:5px; position: fixed; z-index:5000;}
.caja-aviso{
border:4px double #0080FF; /* Color del borde */
-webkit-border-radius: 10px; -moz-border-radius: 10px; border-radius: 10px; -webkit-box-shadow: 8px 8px 6px #808080; -moz-box-shadow: 8px 8px 6px #808080; box-shadow: 8px 8px 6px #808080;
background-color: #A1FCF2; /* Color de fondo */
padding: 10px; font-family: Verdana, Geneva, sans-serif;
color: #000000; /* Color del texto */
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.letrero-aviso { /* Estilos de la palabra AVISO */
font-size:18pt;
font-weight:bold;
color:#B4045F;
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<legend class="letrero-aviso" align="center">AVISO</legend>
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