.cuatrocolumnas {
margin-top: 1em;
float: left;
width: 22%;
height: 38em;
border: 0.1em solid #946b6b;
}
.cuatrocolumnas4 {
margin-top: 1em;
float: left;
width: 28%;
height: 38em;
border: 0.1em solid #946b6b;
}
.total {
clear: both;
}
.trescolumnas {
float: left;
height: 13em;
width: 30%;
border: 0.1em solid #946b6b;
}
.columna_delgada {
font-weight: bold;
margin-right: 2em;
float: left;
width: 12em;
height: 5em;
clear: left;
}
.doscolumnasI{
float: left;
width: 47.5%;
height: 28em;
border: 0.1em solid #065552;
margin-left: 0.1em;
padding-left: 1em;
}
.doscolumnasD{
float: right;
width: 47.5%;
height: 28em;
border: 0.1em solid #065552;
margin-left: 0.1em;
padding-left: 1em;
}

#principal ul li {
padding-top: 0em;
padding-bottom: 0em;

}
ul.columna {
margin-left: -4em;
}
.flechas {
background-image: URL("../imagenes/tronco_ramas.png");
background-repeat: no-repeat;
background-position: 50% 16.2em;
}
.columnacentral {

margin-left: auto;
margin-right: auto;
width: 70%;
border: 0.1em solid #946b6b;
}
.unacolumna {
width: 100%;
height: 5em;

}