* {
  box-sizing: border-box;
}

h2 {
  margin: 5px;
}

h1 {
  text-align: center;
  font-size: 20px;
}

#books-container div {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 5px;
}

.time {
  text-align: right;
}

#books-container:has(div) {
  position: relative;
  border: 2px solid gray;
  margin-bottom: 50px;
}

#books-container div.gray {
  background-color: #d5d5d5;
}

#books-container:has(div)::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 3px;
  left: 50%;
  bottom: -25px;
  transform: translateX(-50%);
  border-radius: 50%;
  background-color: gray;
}

form {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  position: relative;
  width: fit-content;
  margin-top: 40px;
  left: 50%;
  transform: translateX(-51%);
}

form button {
  position: absolute;
  bottom: -20px;
  right: 0;
}

nav {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  border: 2px solid;
  align-items: center;
  padding: 0 20px;
}

header ul {
  display: flex;
  flex-direction: row;
  gap: 15px;
  list-style-type: none;
}

header ul li {
  padding: 0 10px;
  cursor: pointer;
}

header ul li:hover,
header ul li.active {
  color: blue;
}

header ul li:not(:first-child) {
  border-left: 2px solid;
}

#contact {
  display: none;
  margin-left: 30px;
}

footer {
  position: fixed;
  bottom: 0;
  left: 0;
  padding: 10px 0 10px 0;
  border: 2px solid;
  width: 100%;
  background-color: white;
}

footer p {
  margin: 0 20px;
}