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

header {
  display: flex;
  width: 80%;
  margin: 10px auto 0;
  padding: 10px;
  border: 3px black solid;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.date {
  position: absolute;
  bottom: -25px;
  right: 0;
  font-weight: bold;
}

#nav-links {
  display: flex;
}

#nav-links li {
  padding: 5px;
  border-right: 2px black solid;
  list-style: none;
}

#nav-links li:last-child {
  border-right: none;
}

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

main {
  min-height: 330px;
}

.year {
  color: red;
  margin: 10px 10px 0 0;
  font-size: 1.2rem;
  text-align: end;
}

.header {
  width: 80%;
  margin: 40px auto;
  text-align: center;
}

.tab-content {
  display: none;
}

.booksContainer {
  border: 2px black solid;
  width: 80%;
  margin: auto;
}

.book-card {
  display: flex;
  border: 0.5px gray solid;
  padding: 10px;
  justify-content: space-between;
}

.form {
  width: 40%;
  margin: auto;
  text-align: center;
  padding: 0 3.5rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.form h2,
#contact h2 {
  margin: 2.5rem 0 4rem;
}

.form input {
  width: 100%;
  height: 35px;
}

.remove-btn {
  padding: 5px;
  border: none;
  background-color: rgb(179, 4, 4);
  color: white;
}

.addButton {
  border: 2px solid black;
  padding: 4px 1rem;
  align-self: flex-end;
}

#contact {
  width: 80%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#contact h2,
#contact p {
  text-align: center;
}

#contact ul {
  width: max-content;
  margin: 1.5rem auto;
}

footer {
  width: 80%;
  margin: 10px auto;
  border: 3px black solid;
  padding: 20px;
  bottom: 0;
  left: 8.2998rem;
}