html {
  font-size: 10px; /* px signifie 'pixels': la taille de base pour la police est désormais 10 pixels de haut  */
  font-family: 'Open Sans', sans-serif; /* cela devrait être le reste du résultat obtenu à partir de Google fonts */
  background-color: rgb(202, 10, 10);
}

.body{
  width: 800px;
  margin: 0 auto;
  background-color: #ffffff;
  padding: 0 20px 20px 20px;
  border: 5px solid black;
  border-radius: 5px;
}

.content {
  background-color: white;
  border: 5px solid black;
  width: 1200px;
  margin: 0 auto;
  padding:20px 20px 20px 20px;
  margin-top: 15px;
  border-radius: 5px;
}

nav {
  border-bottom: 1px solid black;
  border: 0.5em solid black;
  background-color: white;
  width: 800px;
  margin: 0 auto;
  padding: 20px 20px 20px 20px;
  border-radius: 5px;
}

h1 {
  font-size: 60px;
  text-align: center;
  margin: 0;
  padding: 20px 0;
}

p, li {
  font-size: 16px;
  line-height: 2;
  letter-spacing: 1px;
}

.viewer {
  left: 0;
  width: 100%;
  height: 0;
  position: relative;
  padding-bottom: 56.25%;
  padding-top: 30px;
}
.viewer iframe {
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  position: absolute;
  border: 0;
  }

button {
  background: #4CAF50; /* vert principal */
  color: white;
  border: none;
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

button:hover {
  background: #45a049; /* vert un peu plus foncé au survol */
  transform: translateY(-2px);
  box-shadow: 0 6px 10px rgba(0,0,0,0.15);
}

button:active {
  transform: translateY(0);
  box-shadow: 0 3px 5px rgba(0,0,0,0.2);
}

select {
  padding: 10px 15px;
  font-size: 16px;
  border-radius: 8px;
  border: 1px solid #ccc;
  background-color: white;
  color: #333;
  cursor: pointer;
  outline: none;
  transition: all 0.3s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

select:hover {
  border-color: #4CAF50;
  box-shadow: 0 3px 7px rgba(0,0,0,0.15);
}

#presentationSelect, button {
  margin-bottom: 15px; /* espace en bas pour séparer de l’iframe */
}