body {
  margin: 0;
  padding: 0;
  font-size: 1.2rem;
  text-align: center;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #c1dbeb;
}

header {
  padding: 10px 25px;
  background-color: rgb(81, 131, 181);
  color: white;
  margin-bottom: 20px;
}


main {
  margin-bottom: 30px;
}

.instructions {
  font-size: 2rem;
}

.image-modele {
  width: 100%;
  max-width: 500px;
}

.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: rgb(13, 207, 237);
  padding: 15px 30px;
  border-top: 1px solid lightblue;
}


.num-counter {
  padding: 5px 10px;
  background-color: black;
  color: white;
  font-weight: bold;
}

.ocean {font-size: small;}