@media (max-width:740px) {

  /* your conditional / responsive CSS inside this condition */
  
  
.Columna{
display:block;
float:none;
overflow:hidden;
}
.Columna.right{
float:none;
}

header .Menu{
margin:0px;
display:block;
float:none;
font-size:1em;
}
header .Usuario{
float:none;

}

.Central{
width:auto;
min-width:auto;
margin:0px;
padding:4px;
}


.Lateral{
display:block;
float:none;
width:auto;
border-right:none;
}
.Principal{
display:block;
float:none;
width:auto;
}

.Ruta .RutaItem{
display:inline-block;
}

}