body {
  text-align: center;
}

.main-container {
  max-width: 500px;
  margin: 0 auto;
}

.hr {
  width: 100px;
  border: 1px solid gray;
}

form {
  width: fit-content;
  margin: 0 auto;
  text-align: end;
}

#book-list {
  margin-top: 30px;
  margin-bottom: 30px;
  border: 2px solid gray;
}

input {
  margin-bottom: 10px;
  width: 200px;
  padding: 5px;
}

.bookTitle {
  margin-right: 10px;
  margin-left: 20px;
}

span {
  margin-right: 10px;
}

.bookList1 {
  display: flex;
  position: relative;
}

.bookList1:nth-child(even) {
  background: #ccc;
}

.bookList1:nth-child(odd) {
  background: #fff;
}

.delete {
  position: absolute;
  right: 20px;
  top: 20%;
}

button {
  padding: 5px;
}