* {
  margin:0px;
  padding:0px;
}

#contenedor {
    width:800px;
    height:auto;
    margin:auto;
}

#columna1
{
  float:left;
  width:250px;
  margin:0;
  padding:1em;
  text-align: justify;
  font-family:Arial Narrow;
  font-size:14px;
  color:#6B4226;
}

#columna2
{
  margin-left:260px;
  margin-right:250px;
  padding:1em;
  text-align: justify;
  font-family:Arial Narrow;
  font-size:14px;
  color:#6B4226;
}

#columna3
{
  float:right;
  width:250px;
  margin:0;
  padding:1em;
  text-align: justify;
  font-family:Arial Narrow;
  font-size:14px;
  color:#6B4226;
}