Removed some unnecessary CSS overrides.

There's an attribute for that.

resources/report/css/overrides.css

@@ -1,16 +1,5 @@
 /* These styles override Polymer's own internal styling for certain elements. */
 
-/* The following 3 rules are for setting the sizes of the drawer and panel. */
-#container::shadow #main {
-    left: 33% !important;
-}
-#container::shadow .narrow-layout #main {
-    left: 0 !important;
-}
-#container::shadow #drawer {
-    width: 33% !important;
-}
-
 /* These overrides change the colour of the game menu's text and underline. */
 #gameMenu::shadow > paper-dropdown-menu {
     border-bottom-color: #f1f1f1;

resources/report/report.html

@@ -98,7 +98,7 @@
         <paper-button id="applySortButton" class="hidden">Apply</paper-button>
         <paper-button id="cancelSortButton" class="hidden">Cancel</paper-button>
     </core-toolbar>
-    <core-drawer-panel id="container">
+    <core-drawer-panel id="container" drawerWidth="33%">
         <div drawer vertical layout>
             <paper-tabs id="sidebarTabs" selected="0">
                 <paper-tab>Plugins</paper-tab>