html{
scroll-behavior: smooth;
/* la page douce ves lelement cible */
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background: #f9f9f9;
}


ul {
  position: sticky;
  top: 0;
  margin: 0;
  padding: 15px 0;
  list-style: none;
  display: flex;
  justify-content: center;
  background: #333;
  z-index: 1000;
}

ul li {
  margin: 0 20px;
}

ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

ul li a:hover {
  text-decoration: underline;
}

div[id^="paragraphe"] {
  padding: 40px;
  max-width: 900px;
  margin: 40px auto;
  background: white;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}


h2 {
  margin-top: 0;
  color: #333;
}


#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  padding: 12px 18px;
  background: #333;
  color: white;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  font-weight: bold;
}

#backToTop:hover {
  background: #555;
}