body {
  font-family: 'Georgia', serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.book {
  width: 100%;
  height: 100%;
  background: #fff;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.header {
  background: #4a90e2;
  color: #fff;
  padding: 10px;
  text-align: center;
}
.content {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  font-size: 1rem;
  line-height: 1.6;
}
.footer {
  display: flex;
  justify-content: space-between;
  padding: 10px;
  background: #ddd;
}
.footer button {
  background: #4a90e2;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
}
.footer button:disabled {
  background: #bbb;
  cursor: not-allowed;
}

.contenu_chapitre
{
	display:none;
}