body {
  margin-left: auto;
  margin-right: auto;
  width: 90%;
  font-size: 16px;
}
#header {
  background-color: #33ff33;
  color: black;
  text-align: center;
  padding-top: 0.5em;
  padding-bottom: 0.5em;
}
#barranav {
  background-color: #ffff99;
  text-align: center;
  float: left;
  position: absolute;
  top: 150px;
  width: 250px;
  height: 1000px;
}
#contenido {
  background-color: #ccffff;
  padding-top: 10px;
  padding-right: 20px;
  text-align: justify;
  padding-left: 10px;
  margin-left: 260px;
  margin-top: 5pt;
  height: 1000px;
}
#cinta {
  background-color: #33ccff;
  padding-top: 0.5em;
  padding-bottom: 0.5em;
  margin-top: 5px;
  height: 18px;
  font-family: Arial,Helvetica,sans-serif;
  font-size: 13px;
}