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

h1 {
  margin: 50px 0 20px 0;
}

#books-section {
  display: flex;
  flex-direction: column;
}

#books {
  border: 2px solid black;
  border-radius: 5px;
  width: 90%;
  display: flex;
  margin: 10px auto;
  flex-direction: column;
}

form button {
  position: absolute;
  right: 10%;
  padding: 2px 10px;
  box-shadow: black 2px 3px;
  border: solid 2px black;
}

.book button {
  position: absolute;
  right: 5px;
  box-shadow: rgb(131, 124, 124) 2px 2px;
  border: solid 2px black;
  border-radius: 0;
  padding: 2px 3px;
  margin-top: -2px;
}

.book {
  width: 100%;
  display: flex;
  flex-direction: row;
  position: relative;
  padding: 10px 5px;
}

.book:nth-child(even) {
  background-color: rgb(211, 230, 173);
}

form {
  position: relative;
  padding-top: 10px;
}

.addBookForm {
  max-width: 500px;
  width: 80%;
  display: flex;
  flex-direction: column;
  margin: 10px auto 0 auto;
}

form input {
  width: 80%;
  max-width: 500px;
  padding: 5px;
  margin-top: 5px;
  margin-bottom: 5px;
  text-align: left;
  border: 2px solid black;
  padding-top: 10px;
}

.addBookForm h3 {
  padding-bottom: 10px;
}

nav {
  display: flex;
  justify-content: space-between;
  border: solid 2px black;
  padding: 5px;
  margin: 10px auto;
  max-width: 90%;
}

nav ul {
  display: flex;
  list-style-type: none;
}

#nav-border {
  border-left: solid 2px black;
  border-right: solid 2px black;
}

nav ul li {
  padding: 0 10px;
}

nav ul li a {
  text-decoration: none;
  color: black;
}

footer {
  border: solid 2px black;
  padding: 5px;
  margin: 10px 5%;
  width: 90%;
  position: absolute;
  bottom: 0;
  text-align: left;
}

.timer {
  padding-right: 8px;
  width: 90%;
  margin: 10px 5%;
  text-align: right;
}