body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

#btn-add {
  margin-top: 5%;
}

.container {
  width: 100%;
  margin-top: 3%;
  display: flex;
  flex-direction: column;
  font-size: 20px;
  font-weight: 700;
  align-items: center;
}

.bookList > div:nth-child(odd) {
  background: #e0e0e0;
}

.container hr {
  border: 2px solid #000;
  width: 50px;
  margin-top: 20px;
  margin-bottom: 20px;
}

.bookList {
  border: 2px solid #000;
}

.books_container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 350px;
  padding: 0 10px;
}

.books_container button {
  background-color: #fff;
  border: 1px solid #000;
  font-size: 12px;
  font-weight: 700;
  padding: 5px;
  box-shadow: 2px 2px 2px 2px rgba(0, 0, 0);
  cursor: pointer;
}

.form_styles button {
  background-color: #fff;
  border: 1px solid #000;
  font-size: 12px;
  font-weight: 700;
  padding: 5px;
  box-shadow: 2px 2px 2px 2px rgba(0, 0, 0);
  cursor: pointer;
  float: right;
}

.container h1 {
  font-size: 20px;
}

.form_styles h2 {
  font-size: 20px;
}

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

.form_styles input {
  width: 100%;
  border: 2px solid #000;
}

.books_container p {
  font-size: 12px;
}

.main-menu {
  justify-content: space-between;
  padding: 0 15px;
  border: 2px solid #000;
  display: flex;
  align-items: center;
}

.main-menu ul {
  list-style-type: none;
  display: flex;
  justify-content: space-evenly;
}

.main-menu li {
  font-size: 16px;
  font-weight: 700;
  margin-right: 12px;
}

.footer-section {
  padding: 0 10px;
  border: 2px solid #000;
  display: flex;
  align-items: center;
  margin-top: 15%;
}

.main-menu hr {
  border: 2px solid #000;
  height: 50%;
}

.dates p {
  float: right;
}

.footer-section h2 {
  margin: 0;
}

.main-content {
  padding: 30px;
  display: flex;
  flex-direction: column;
}

#date {
  text-align: right;
}

.main-list li:nth-child(2) {
  border-right: 2px black solid;
  border-left: 2px black solid;
  padding: 0 10px 0 10px;
}

li a {
  text-decoration: none;
}

.contacts {
  justify-content: center;
  text-align: center;
}