style.css

*{
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; /* Definimos la fuente de todos los elementos del documento que lleven texto */
  color: rgb(255, 255, 255);
}

html, body {
  margin: 10 px;
  padding: 5 px;
  /* background-image: url('imagenes/backg.jpg'); */
  background-size: 57%;
  background-color: black;
}

canvas {
  display: block;
}

#encabezado{
  background-image: url('imagenes/fondo-b.png');
  background-size: 251px;
  height: 100px;
  margin: 2px;
  padding: 3px;
  background-position: left;
  background-color: rgba(0,0,0,20);
}

p{
 font-size: larger;
 font-weight: bold;
}

button{
  color: rgb(0, 0, 0);
  padding: 3px;
  margin: 5px;
  border-radius: 10px;
  border: 2px solid rgb(118, 7, 170);
  width: 180px;
  transition-duration: 0.4s;
  box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
  font-size: Larger;
  font-weight: bolder;
  font-style: oblique;
}

.pie{
  background-color: rgba(208, 218, 224, 0.13);
  position: fixed;
  width: 97%;
  padding: 10px;
  margin: 5px;
  margin-top: 730px;
}