body
{
    text-align: center; font-family: monospace; background-color: orange;
}

header
{
    font-size: 60px;
}

main
{
    font-family: Georgia; font-size: 20px;
}

#historia
{
  width: 200px;  height: 75px; font-family: cursive; font-size: 15px; background-color: aqua;
}

#biologia
{
  width: 200px;  height: 75px; font-family: cursive; font-size: 15px; background-color: aqua;
}