body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #f0f0f0;
  color: #333;
  font-size: 1em;
}

h1 {
  margin-top: 20px;
  font-size: 3em;
}

.presentation {
  width: 80%;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  margin: 20px 0;
  padding: 20px;
  font-size: 1.2em;
}

.presentation img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 20px;
}

h2 {
  margin-top: 20px;
  font-size: 2.5em;
}

#container {

  margin-top: 20px;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

ul {
  list-style-type: none;
  padding: 0;
  width: 80%;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  margin-top: 20px;
  padding: 20px;
  font-size: 1.2em;
}

li {
  padding: 10px;
  border-bottom: 1px solid #ddd;
}

li:last-child {
  border-bottom: none;
}