body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #000000;
}

nav {
  background-color: #40c965;
  padding: 1em;
  text-align: center;
  color: white;
}

footer {
  background-color: #40c965;
  padding: 1em;
  text-align: center;
  color: white;
  position: fixed;
  width: 100%;
  bottom: 0;
}

main {
  padding: 2em;
  margin-bottom: 60px; /* espace pour le footer */
}

button {
  background-color: #7289da;
  color: white;
  border: none;
  padding: 0.75em 1.5em;
  font-size: 1em;
  cursor: pointer;
  border-radius: 5px;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #99aab5;
}