.contenedor{
    width: 890px;
    margin: auto;
    background: #ED9E9E;
    padding: 9px 0px 65px 50px;
}
#pestanas {
    float: top;
    font-size: 14px;
    font-weight: bold;
}

#pestanas ul{
    margin-left: -40px;    
}

#pestanas li{
    list-style-type: none;
    float: left;
    text-align: center;
    margin: 0px 2px -2px -0px;
    background: orange;
    padding: 0px 20px 0px 20px;
}

#pestanas a:link{
    text-decoration: none;
    color: white;
}

#contenidopestanas{
    clear: both;  
    padding: 20px 0px 20px 20px;

}