Remove unused elements from stylesheet

static/css/style.css

@@ -23,50 +23,15 @@ a:hover, a:active {
     transition-duration: 0.3s;
 }
 
-.introduction {
-    margin-left: 20px;
-    width: 600px;
-    margin-bottom: 4ex;
-}
-
-.cover {
-    float: left;
-    width: 190px;
-}
-
-.cover img {
-    display: block;
-}
-
-.description {
-    margin-left: 180px;
-    margin-bottom: 6ex;
-    width: 600px;
-    height: 220px;
-}
-
 ul {
     list-style-type: square;
 
 }
 
-h3.booktitle, h4.authorname {
-    font-weight: 400;
-    font-style: italic;
-}
-
-ul.covers {
-    list-style: none;
-}
-
 .monospace {
     font-family: monospace;
 }
 
-td.right-align {
-    text-align: right;
-}
-
 td {
     padding: 2pt;
     border-bottom: 1px solid #ddd;