body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #111;
  color: #f2f2f2;
}

header {
  background-color: #000;
  text-align: center;
  padding: 2rem;
}

header h1 {
  margin: 0;
  font-size: 3rem;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 2rem;
}

.presentation {
  text-align: center;
}

.presentation img {
  max-width: 300px;
  border-radius: 10px;
  margin-bottom: 1rem;
}

a {
  display: inline-block;
  margin-top: 1rem;
  color: #1db954;
  text-decoration: none;
  font-weight: bold;
}

a:hover {
  text-decoration: underline;
}

h2 {
  margin-top: 3rem;
  border-bottom: 2px solid #1db954;
  padding-bottom: 0.5rem;
}

ol {
  margin-top: 1rem;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #000;
  font-size: 0.9rem;
}

.droite {
  text-align: right;
}