added another Zadie Smith book entry and edited ol styling

bellapanghulan_reading/static/stylesheets/author_details.css

@@ -25,6 +25,7 @@ h2 {
 }
 
 ol {
+    width: 75%;
     display: grid;
     grid-template-columns: 1fr 1fr 1fr;
     column-gap: 0.5rem;
@@ -52,7 +53,6 @@ li {
     text-align: center;
     border: 1px solid #7448F6;
     border-radius: 5px;
-    width: 50%;
     color: black
 }