index.css

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'KG Miss Kindy Chunky', sans-serif;
}

/* ======= Beginning of the navigation and date style */
a {
  text-decoration: none;
  color: #000;
}

.container {
  margin: 0 5vw;
}

.nav-container {
  width: 100vw;
  margin-left: -5vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 2px solid #000;
}

.logo a {
  font-weight: bold;
  color: #3b3939;
  margin-left: 15px;
  cursor: pointer;
}

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

.nav-container ul li {
  padding: 5px;
  border-right: 2px solid #000;
  cursor: pointer;
}

#contact {
  display: none;
}

.nav-links li a:hover {
  color: blue;
}

.timeDisplay {
  float: right;
}

#add-book {
  display: none;
}

/* end of the navigation and date style */
.app-title,
.add-book,
.contact-title {
  text-align: center;
}

.app-title h1,
.contact-title h2,
#add-book h2 {
  font-size: 42px;
}

#book-display {
  margin: 16px 36px;
}

#book-display.active,
#add-book.active,
#contact.active {
  display: flex;
  flex-direction: column;
}

.book-list {
  display: flex;
  flex-direction: column;
  border: 3px solid #000;
}

/* stylelint-disable-next-line no-descending-specificity */
.book-list li {
  list-style: none;
  line-height: 2.4;
  display: flex;
  justify-content: space-between;
  padding: 8px 20px;
}

.book-list li:nth-child(odd) {
  background-color: rgba(137, 137, 138, 0.5);
}

.item-list {
  font-size: 17px;
  font-weight: 700;
}

.remove-btn,
.btn {
  width: 94px;
  height: 34px;
  padding: 2px;
  font-size: 18px;
  font-weight: 600;
  box-shadow: 3px 3px;
  border: 3px solid #000;
  background-color: #fff;
  cursor: pointer;
}

.form-div {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-top: -50px;
}

.warning {
  color: #f31111;
}

.inputField {
  width: 365px;
  height: 42px;
  font-size: 17px;
  font-weight: 200;
  padding: 0 10px;
  border: 3px solid;
  outline: none;
}

.inputField::placeholder {
  font-weight: 600;
}

.submit-btn {
  width: 60px;
  margin-left: 330px;
}

.contact-me {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-text,
.contact-list {
  font-size: 18px;
}

/* stylelint-disable-next-line no-descending-specificity */
.contact-list li a {
  text-decoration: none;
  color: #000;
}

footer {
  border: 3px solid;
  margin: 16px 36px;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.footer-info {
  display: flex;
  gap: 26px;
  padding: 8px 20px;
}

.footer-info p {
  font-size: 18px;
}

/* stylelint-disable-next-line no-descending-specificity */
.text-2 a:hover {
  color: blue;
  text-decoration: underline;
}