Fix GitbookIO#310: improve display of long title in header

Author: SamyPesse

theme/assets/style.css

@@ -44,12 +44,16 @@
             padding-right: 200px;
             .transition(margin-left 0.5s ease);
 
+            overflow: hidden;
+            text-overflow: ellipsis;
+            white-space: nowrap;
+
             a, a:hover {
                 color: inherit;
                 text-decoration: none;
             }
 
-            @media (max-width: 800px) {
+            @media (max-width: 1000px) {
                 display: none;
             }