body {
    margin: 0;
    padding: 0;
    font-size: 1.2rem;
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

header {
padding: 10px 25px;
background-color: slategrey;
color:white;
margin-bottom: 20px;
}

main{
    margin-bottom: 30px;
}

.instructions-text {
font-size: 1.5rem;
}
.Pyramide-image {
width: 100%;
max-width: 600px;
}
.switch-button {
  background: #3498db;
  background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
  background-image: -moz-linear-gradient(top, #3498db, #2980b9);
  background-image: -ms-linear-gradient(top, #3498db, #2980b9);
  background-image: -o-linear-gradient(top, #3498db, #2980b9);
  background-image: linear-gradient(to bottom, #3498db, #2980b9);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: #ffffff;
  font-size: 2rem;
  padding: 15px 40px 14px 40px;
  text-decoration: none;
  border: none;
  border-radius: 10px;
  margin-bottom: 20px;
}

.switch-button:hover {
  background: #3cb0fd;
  background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
  background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
  background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
  text-decoration: none;
}
footer {
  background-color: aliceblue;
  padding: 15px 30px;
  border-top: 1px solid lightblue;
}
.num-counter {
  padding: 5px 10px;
  background-color: black;
  color: white;
  font-weight: bold;
}