* {margin: 0; padding: 0;}

body {
  background-color: black;
  color: white;
  font-family: Helvetica, sans-serif;
}

.container {
  width: 60%;
  margin: 50px auto;
  max-width: 1800px;
  text-align: center;
}

h1 {
  font-family: "Tahoma", Helvetica, sans-serif;
  font-size: 2.2em;
  color: #2992d3;
  margin: 12px auto;
}

p {
  margin: 10px auto;
  font-size: 1.2em;
}

.titles {
  margin-top: 40px;
}

.book-image {
  max-width: 500px;
  width: 47%;
  display: "inline-block";
  padding: 1% 1% 0 0;
  opacity: 1;
  -webkit-transition: .5s ease-in-out;
  transition: .5s ease-in-out;
}

.book-image:hover {
  	opacity: .7;
    cursor: pointer;
}

footer {
  text-align: center;
  padding-top: 25px;
  margin-right: 15px;
}


@media only screen and (max-width: 1200px)
{
  .container {
      width: 80%;
  }

  .book-image {
      width: 100%;
      margin: 10px auto;
  }
}

@media only screen and (max-width: 550px) {

    h1 {
        font-size: 2em;
    }

    .logo {
        width: 100%;
        min-width: 100px;
        max-width: 365px;
    }
}