Fixed the navbar to the top.

Made the font of the inputs in vouchers bigger by 25%
Made the narration textarea minimum 5 lines
Changed the favicon to the old favicon

overlord/src/app/core/nav-bar/nav-bar.component.css

@@ -12,3 +12,13 @@
      Every toolbar row uses a flexbox row layout. */
   flex: 1 1 auto;
 }
+
+.fixed-to-top {
+  position: fixed;
+  top: 0;
+  z-index: 999;
+}
+
+.toolbar-fix {
+  height: 64px;
+}

overlord/src/app/core/nav-bar/nav-bar.component.html

@@ -1,4 +1,4 @@
-<mat-toolbar>
+<mat-toolbar class="fixed-to-top">
   <button
     type="button"
     aria-label="Toggle sidenav"
@@ -87,3 +87,4 @@
     <mat-icon>account_box</mat-icon>
     Login</a>
 </mat-toolbar>
+<div class="toolbar-fix"></div>