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

body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 25px 30px;
  font-family: 'Poppins', sans-serif;
}

h1 {
  text-align: center;
}

#title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
}

#title h1 {
  padding: 5px 15px 25px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  border: 2px solid black;
}

header nav {
  display: flex;
  padding: 10px;
}

header h3 {
  margin-left: 10px;
  font-size: medium;
}

header nav li {
  list-style: none;
}

header nav li a {
  text-decoration: none;
  color: black;
  margin-right: 30px;
  border-right: 2px solid black;
  padding-right: 15px;
  font-size: 16px;
}

header nav li a:hover {
  color: rgb(43, 133, 230);
}

.time {
  display: flex;
  justify-content: flex-end;
  width: 100%;
  padding-top: 20px;
  padding-bottom: 20px;
}

#currentDateTime {
  border: none;
}

.container {
  width: 100%;
  display: none;
}

.center-text {
  text-align: center;
}

.active-page {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.active {
  color: blue;
}

#add-book {
  display: grid;
  grid-template-columns: auto;
  grid-template-rows: auto;
  width: 100%;
  border: 4px solid black;
  border-radius: 4px;
  margin: 50px 5px 10px;
  min-height: 26px;
  max-height: 50vh;
  overflow-y: scroll;
}

#add-book li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 5px;
  background-color: rgb(206, 206, 206);
}

#add-book li:nth-of-type(2n) {
  background-color: #fff;
}

#book-entry button {
  padding: 5px 10px;
  font-size: 16px;
  border: 2px solid;
  box-shadow: 3px 3px 2px 1px black;
  background-color: #fff;
}

#add-book li button {
  text-align: right;
  font-size: 12px;
  font-weight: 700;
  padding: 5px;
  margin-right: 10px;
  box-shadow: 2px 2px 2px 1px black;
  background-color: #fff;
}

#book-entry button:hover {
  background-color: black;
  color: white;
}

#book-entry button:active {
  background-color: teal;
  color: white;
}

#add-book div {
  display: flex;
}

#add-book li h2 {
  font-size: 16px;
  margin-right: 5px;
}

#contact p {
  margin-bottom: 10px;
}

#contact ul {
  margin-left: 50px;
  margin-top: 15px;
}

#add-book li p {
  font-size: 16px;
}

#info h1 {
  margin-bottom: 50px;
}

#book-entry {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  width: 50%;
  height: 35vh;
}

#book-entry input {
  width: 100%;
  padding: 10px;
  margin-bottom: 25px;
  border: 3px solid rgb(9, 0, 0);
  border-radius: 15px;
}

footer {
  position: fixed;
  bottom: 0;
  border: 4px solid black;
  width: 95%;
  padding: 10px;
  margin-bottom: 10px;
}

#contact {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 50vh;
  width: auto;
  font-size: 20px;
  line-height: 35px;
}

#contact h1 {
  margin: 20px;
}