body {
    margin: auto;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

nav li {
    float: left;
}

nav li a {
    display: block;
    color: #9d9d9d;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none !important;
}

.active, nav li a:hover, .dropdown:hover .dropbtn {
    background-color: #111;
    color: white;
}

.drop {
  float: left;
  overflow: hidden;
}

.drop .dropbtn {
  border: none;
  outline: none;
  color: #9d9d9d;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  float: none;
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.drop:hover .dropbtn, .dropdown-content a:hover {
  color: white;
  background-color: #111;
}

.drop:hover .dropdown-content {
  display: block;
}

table {
    border-spacing: 0;
    border-collapse: collapse;
}

.font25 {
    font-size: 25px;
}

@media screen and (max-width: 600px) {
    nav li a, .drop .dropbtn {
    font-size: 16px;
    padding: 8px 8px;
    }
}

@media screen and (max-width: 400px) {
    nav li a, .drop .dropbtn {
    font-size: 14px;
    padding: 6px 6px;
    }
}

main {
    padding: 10px 20px;
}

.feature li {padding-bottom: 8px;}

.summary strong {font-size: 20px;}
.summary span {font-size: 16px;}

h2 {background: #FFA100; color: #fff; padding: 10px; font-weight: bold;}

.bookcover:hover {
    -webkit-box-shadow: 2px 2px 10px rgba(0,0,0,.2);
    -khtml-box-shadow: 2px 2px 10px rgba(0,0,0,.2);
    -moz-box-shadow: 2px 2px 10px rgba(0,0,0,.2);
    -ms-box-shadow: 2px 2px 10px rgba(0,0,0,.2);
    -o-box-shadow: 2px 2px 10px rgba(0,0,0,.2);
    box-shadow: 2px 2px 10px rgba(0,0,0,.2);
    -webkit-transition: all,.25s,ease;
    -khtml-transition: all,.25s,ease;
    -moz-transition: all,.25s,ease;
    -ms-transition: all,.25s,ease;
    -o-transition: all,.25s,ease;
    transition: all,.25s,ease;
}

footer {
    font-size: 13px;
    color: #888;
    border-top: 1px solid #eee;
    margin-top: 25px;
    text-align: center;
    padding: 10px;

}