Edit top app bar

Begin to make it into a short app bar

computer-science-blog/index.html

@@ -68,7 +68,7 @@
         <div class="mdc-drawer-scrim"></div>
 
         <div class="mdc-drawer-app-content">
-            <header class="mdc-top-app-bar app-bar" id="app-bar"></header>
+            <header class="mdc-top-app-bar app-bar mdc-top-app-bar--short" id="app-bar"></header>
 
             <main class="main-content" id="main-content">
                <div class="mdc-top-app-bar--fixed-adjust">