* {
  padding: 0;
  margin: 0;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 50px;
  font-size: 20px;
}

.header {
  padding: 20px;
}

.container {
  display: flex;
  flex-direction: column;
  gap: 50px;
}

.bookshelf {
  display: flex;
  gap: 50px;
  flex-wrap: wrap;
}

.book {
  border: solid 1px black;
  border-radius: 10px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: 5px 3px 3px rgb(211, 211, 211);
}

input {
  border: none;
  padding: 10px;
  font-size: 1rem;
  color: black;
}

form > input {
  border: 1px solid black;
}

.popup-box {
  width: 210px;
  background-color: white;
  padding: 20px;
  border-radius: 10px;

  transform: scale(0);
}

.popup-box {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.popup-container {
  font-size: 20px;
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(95, 125, 84, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
}
.popup-container.active {
  opacity: 1;
  pointer-events: auto;
  transition: 0.4s ease;
}
.popup-container.active .popup-box {
  transform: scale(1);
  transition: 0.4s ease;
  transition-delay: 0.25s;
}

/* CSS */
.btn {
  align-items: center;
  appearance: none;
  background-color: #fff;
  border: 1px solid #dbdbdb;
  border-radius: 0.375em;
  box-shadow: none;
  box-sizing: border-box;
  color: #000000;
  cursor: pointer;
  display: inline-flex;
  font-family: BlinkMacSystemFont, -apple-system, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Helvetica,
    Arial, sans-serif;
  font-size: 1rem;
  height: 2.5em;
  justify-content: center;
  line-height: 1.5;
  padding: calc(0.5em - 1px) 1em;
  text-align: center;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  vertical-align: top;
  white-space: nowrap;
}

.btn:active {
  border-color: #4a4a4a;
  outline: 0;
}

.btn:focus {
  border-color: #485fc7;
  outline: 0;
}

.btn:hover {
  border-color: #b5b5b5;
}

.btn:focus:not(:active) {
  box-shadow: rgba(72, 95, 199, 0.25) 0 0 0 0.125em;
}

.close-btn {
  background-color: rgb(255, 83, 83);
  color: white;
  height: 30px;
}

.errorMessage {
  color: rgb(255, 83, 83);
}

.delete-btn {
  background-color: rgb(255, 83, 83);
  color: white;
}