<!-- cabecera - inicio -->
body {
border:0px;
  margin:0px;
  padding:0px;
  background-color:#2C6BBA;
  color:#FF0000;
  background-image:url(imagenes/fondo.jpg);
}
<!-- cabecera - fin -->
<!-- tablas - inicio -->
table {
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size: 8pt;
background-color:#FFFFFF;
color:#003399;
}
td {
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size: 8pt;
background-color:#FFFFFF;
color:#003399;
}
.principal {
  font-size: 8pt;
  font-family: Verdana;
  color: #003366;
  background-color:#CCCCCC;
}
.marco_superior_izquierdo {
background-color:#666666;
}
.marco_superior {
background-color:#666666;
}
.marco_supeior_derecho {
background-color:#666666;
}
.marco_central_izquierdo {
background-color:#666666;
}
.marco_central {
background-color:#666666;
}
.marco_central_derecho {
background-color:#666666;
}
.marco_inferior_izquierdo {
background-color:#666666;
}
.marco_inferior {
background-color:#666666;
}
.marco_inferior_derecho {
background-color:#666666;
}
.cabecera {
background-color:#3366CC;
color:#FF9933;
}
.separador_1 {
background-color:#CCCCCC;
}
.separador_2 {
background-color:#999999;
}
.informacion {
background-color:#6699CC;
color:#FFFFFF;
}
.registromensajes {
  font-size: 8pt;
  font-family:  Tahoma, Verdana, Arial;
  color: #003366;
  background-color:#999999;
}
<!-- tablas - fin -->
<!-- links - inicio -->
A:link {
  font-family: Tahoma, Verdana;
  color:#0098F0;
  text-decoration:none; }
A:visited {
  font-family: Tahoma, Verdana;
  color: #0098F0;
  text-decoration:none; }
A:hover {
  font-family: Tahoma, Verdana;
  color: #0098F0;
  text-decoration: underline; }
<!-- links - fin -->
<!-- titulos - inicio -->
h1 {
font-size:14pt;
font-style:normal;
font-weight:bold;
font-family:Verdana, Arial, Helvetica, sans-serif;
color:#003399;
}
h2 {
font-size:12pt;
font-style:normal;
font-weight:bold;
font-family:Verdana, Arial, Helvetica, sans-serif;
color:#003399;
}
h3 {
font-size:10pt;
font-style:normal;
font-weight:bold;
font-family:Verdana, Arial, Helvetica, sans-serif;
color:#003399;
}
<!-- titulos - fin -->
<!-- formularios - inicio -->
select {
  font-size: 9px;
  font-family: Verdana;
  color:#000000;
  background-color:#CCCCCC;
  border-style: none; }
input {
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
  font-family: Tahoma, Verdana, Arial;
  font-size: 11px;
  color:#000000;
  background-color:#CCCCCC;
}
#formBoton {
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
  font-family: Tahoma, Verdana, Arial;
  font-size: 11px;
  color:#000000;
  background-color:#CCCCCC;
  height:25px;
  width:100px;
}
#formEfecto {
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
  font-family: Tahoma, Verdana, Arial;
  font-size: 11px;
  color:#000000;
  background-color:#CCCCCC;
}
#formEfectoMensaje {
  border-top-width: 1px;
  border-right-width: 1px;
  border-bottom-width: 1px;
  border-left-width: 1px;
  font-family: Tahoma, Verdana, Arial;
  font-size: 11px;
  color:#000000;
  background-color:#CCCCCC;
  height:50px;
  width:250px;
}
<!-- formularios - fin -->
<!-- especiales - inicio -->
.smsregistrado{
 background-color:#666666;
 padding:0px;
 overflow-x:auto;
 overflow-y:auto;
 vertical-align:top;
 width: auto;
 height:auto;
}
.mensajeenviado {
 text-align : justify;
 overflow-x:hidden;
 overflow-y:auto;
 padding:3px;
 font-size: 11px;
 font-family: Tahoma, Verdana, Arial;
 background-color:#666666;
 border-top : 3px solid #0048F2;
 color:#FFFFFF;
}
.enproceso{
background-color:#999999;
border:1px solid #A0C6E5;
padding:4px;overflow-x: hidden;
overflow-y:auto;
vertical-align: middle;
position : static;
display : none;
top : 68px;
left : 400px;
color:#FFFFFF;
}
.aviso {
background-color:#FFFF99;
color:#000066;
}
<!-- especiales - fin -->