index.css

* {
  font-family: sans-serif;
  margin: 0;
}

.d-flex {
  display: flex !important;
}

.d-none {
  display: none !important;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  align-content: center;
}

.title {
  text-align: center;
  font-size: 90px;
}

.display-books {
  border: 5px solid;
  width: 100%;
}

.book-container {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  padding: 19px;
  font-size: 30px;
}

.book-author {
  font-size: 26px;
  font-weight: 400;
}

.sub-title {
  font-size: 48px;
  margin-bottom: 43px;
}

.add-book {
  width: 40%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

form {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  width: 100%;
}

input {
  border: 2px solid;
  border-radius: 5px;
  width: 100%;
  height: 38px;
}

button {
  font-size: 32px;
  border: 77px 59px black;
  padding: 4px;
  box-shadow: 7px 6px #000;
}

nav {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  font-size: 25px;
  border: 4px solid;
  padding: 0 10px;
  border-radius: 14px;
  height: 75px;
  align-items: center;
  width: 97%;
  margin-top: 7px;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 25px;
}

a {
  text-decoration: none;
}

.contact-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-content: center;
  align-items: center;
  padding-top: 100px;
  font-size: 40px;
}

footer {
  position: fixed;
  bottom: 13px;
  height: 82px;
  padding: 28px;
  box-sizing: border-box;
  padding-top: 20px;
  border-radius: 13px;
  font-size: 26px;
  font-weight: 700;
  border: 5px solid;
  width: 97%;
}

.time {
  width: 341px;
  height: 50px;
  align-self: flex-end;
  margin-right: 17px;
  color: #c8b4b4;
  font-size: 23px;
  font-weight: 600;
}