.library {
    width: 70%;
    margin-left: 15%;
}

.add-book {
    margin-left: 15%;
    width: 70%;
    margin-top: 20px;
    height: 30px;
}

.new-book-form {
    width: 70%;
    margin-left: 15%;
    margin-top: 20px;
}

.new-book-form label {
    margin-left: 10px;
}