* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.home-btn .material-icons {
  font-size: 24px; 
  vertical-align: middle; 
}

header {
  color: black;
  padding: 20px 0;
  text-align: center;
}

header h1 {
  font-size: 2.5em;
}

nav ul {
  list-style-type: none;
  padding: 0;
}

nav ul li {
  display: inline;
  margin-right: 15px;
}

nav ul li a {
  color: black;
  text-decoration: none;
  font-weight: bold;
  cursor: pointer;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
  padding-top: 20px;
  background: linear-gradient(45deg, #d2001a, #7462ff, #f48e21, #23d5ab);
  background-size: 300% 300%;
  animation: color 12s ease-in-out infinite;
  padding-left: 15px;
}

main {
  padding: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.chapeau {
  display: block;
  max-width: 100%;        
  height: auto;           
  margin: 0 auto;         
}

h2 {
  font-size: 2em;
  margin-bottom: 15px;
}

h3 {
  font-size: 1.5em;
  margin-bottom: 10px;
}

ul, ol {
  margin-left: 20px;
}

ul li, ol li {
  margin-bottom: 10px;
}

footer {
  text-align: center;
  padding: 10px;
  background-color: white;
  color: black;
  margin-top: 20px;
}


@media screen and (max-width: 1200px) {
  body {
    background-color: lightcoral;
  }
@media screen and (max-width: 768px) {
  img {
      max-width: 100%;
      height: auto;
      display: block;
      margin: 0 auto;
  }
}

  .contenu2 {
    border-left: solid 0px red;
  }     

  .content {
    display: flex;
    flex-direction: column;
    overflow-x: auto;
  }
}

@keyframes color {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

#backToTopBtn {
  display: none;
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 99;
  font-size: 20px;
  border: none;
  outline: none;
  background-color: #444;
  color: white;
  cursor: pointer;
  padding: 12px 16px;
  border-radius: 50%;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  transition: background-color 0.3s ease;
}

#backToTopBtn:hover {
  background-color: #666;
}

#accueil {
  font-family: 'Poppins', sans-serif;
}