* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background-color: #f5f5f5;
}

header {
  background-color: #333;
  color: white;
  padding: 15px;
  margin-bottom: 20px;
  text-align: center;
}

section {
  background-color: white;
  border: 1px solid #ddd;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 5px;
}

h2 {
  margin-bottom: 15px;
  font-size: 20px;
}

form div {
  margin-bottom: 10px;
}

label {
  display: block;
  margin-bottom: 5px;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

input[type="checkbox"] {
  margin-right: 5px;
}

button {
  background-color: #333;
  color: white;
  padding: 8px 15px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 5px;
}

button:hover {
  background-color: #555;
}

#bookForm button {
  margin-top: 10px;
}

#incompleteBookList div,
#completeBookList div {
  border: 1px solid #ddd;
  padding: 15px;
  margin-bottom: 10px;
  border-radius: 4px;
  background-color: #fafafa;
}

#incompleteBookList h3,
#completeBookList h3 {
  margin-bottom: 10px;
}

#incompleteBookList p,
#completeBookList p {
  margin-bottom: 5px;
  color: #666;
}

#incompleteBookList button,
#completeBookList button {
  margin-top: 10px;
  margin-right: 5px;
}

#searchBook {
  display: flex;
  gap: 10px;
}

#searchBookTitle {
  flex: 1;
}