bookshelf.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}

body {
    background-image: url("asset/library.jpg");
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
}

#wrapper {
    backdrop-filter: blur(10px);
    width: 55%;
    margin: 0 auto;
    border: 2px solid;
    border-width: 1.5rem;
    border-color: burlywood;
}

#search-container {
    text-align: center;
    margin-top: 1em;
  }

  #search-preview {
    color: whitesmoke;
    text-align: center;
    margin-top: 0.5em;
  }

#container-one {
    color: aliceblue;
    margin: 2.5em 25px;
    text-align: center;
}

#container-two  {
    color: aliceblue;
    margin: 10em 25px;
}

h1 {
    text-align: center;
}

#container-three, #container-four {
    color: aliceblue;
    margin: 5em 25px;
}

.book-list {
  border-radius: 10px;
  border: 2px solid;
  text-align: left;
  margin: 1rem 0;
  padding-top: 10px;
  text-align: center;
}

.book-title {
  font-size: 25px;
}

.book-author {
  font-style: italic;
  font-size: 20px;

}

.delete {
  padding: 6px 10px;
  border: 2px solid red;
  border-radius: 4px;
  margin: 0.5rem 0;
  cursor: pointer;
}

.swap {
  padding: 6px 10px;
  border: 2px solid orange;
  border-radius: 4px;
  margin: 0.5rem 0;
  cursor: pointer;
}

.search-book {
    display: flex;
    flex-direction: column;
    margin: 0.5rem 0;
    padding: 0 1rem;
}

label {
    text-align: left;
    font-size: 19px;
}

input[type=text] {
  width: 100%;
  padding: 12px;
  border: 1px solid;
  border-radius: 4px;
  box-sizing: border-box;
  margin: 10px 0;
}

input[type=button] {
  padding: 12px 20px;
  border: none;
  border-radius: 4px;
  margin-bottom: 1em;
  cursor: pointer;
}

@media screen and (max-width: 768px) {
  #wrapper {
      width: 80%;
  }

  #container-one, #container-two, #container-three, #container-four {
      margin: 2.5em 10px;
  }
}

@media screen and (max-width: 480px) {
  #wrapper {
      width: 90%;
  }

  #container-one, #container-two, #container-three, #container-four {
      margin: 2.5em 5px;
  }
}