body{
  font-family: Arial, sans-serif;
  margin: 15%;
  background-image: url(../images/fondo.jpg);
  background-size: cover;
}
#presentacion{
    width: 50% auto;
    height: 50% auto;
    background: rgba(40, 12, 240, 0.76);
    text-align: center;
    padding: 5%;
}
p{
  color: white;
  clear: both;
}
#boton{
  padding: 15px;
  background-color: white;
 text-decoration-line: none;
 color: black;
}