#contenedor {
  width: 90%;
  background: hsl(0, 0%, 100%);
  margin: 10px ;
  margin-bottom: 30px;
}



.pestaña {
  padding: 5px 20px;
  cursor: pointer;
  background-color: #f1f1f1;
  font-size: 14px;
  color: #621132;
  border-top-right-radius: 5px;
  border-top-left-radius: 5px;
  margin: 10px auto;
  width: 10%;
  float: left;
  margin: 2px;
  margin-top: 18px;
  font-size: 1em;
}
.contenido {
  display: none;
}

#tres
{
  margin-top: 2%; background-color: rgb(238, 238, 238) !important;
}