body {
    background: transparent;    
}

.contenedor{
    font-family: arial;
    width: 80%;
    margin: auto;
    background: #C0C1C2;
    color: #647964;
    padding: 20px 15px 50px 50px;
    border-radius: 10px;
    box-shadow: 0 10px 10px 0px rgba(0, 0, 0, 0.8);
}

.titulo{
    font-size: 2.5ex;
    font-weight: bold;
    margin-left: 200px;
    margin-bottom: 10px;
    color: #647964;
}
.titulo1{
    font-size: 1.5ex;
    font-weight: bold;
    margin: auto;
    color: #647964;
    margin-left: 100px;
    margin-right: 100px;
    width: 50%;
}

#pestanas {
    float: top;
    font-size: 2ex;
    font-weight: bold;
}

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

#pestanas li{
    font-family: arial;
    list-style-type: none;
    float: left;
    text-align: center;
    margin: 0px 2px -2px -0px;
    background: #FFFFFF;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    border: 2px solid #647964;
    border-bottom: dimgray;
    padding: 0px 20px 0px 20px;
}

#pestanas a:link{
    text-decoration: none;
    color: #C0C1C2;
}

#contenidopestanas{
    font-family: arial;
    clear: both;  
    background: #FFFFFF;
    padding: 20px 0px 20px 20px;
    border-radius: 5px;
    border-top-left-radius: 0px;
    border: 2px solid #647964;
    color: #647964;
    width: 94%;
}

.center {
	display: block;
	margin-left: auto;
	margin-right: 0;
	width: 50%;
}

.left {
	display: block;
	margin-left: 0;
	margin-right: auto;
	width: 50%;
}