nicer table colours

src/main/resources/static/stylesheet.css

@@ -2,6 +2,8 @@ body {
     --dark-grey: #717171;
     --light-grey: #858585;
     --warning: #ce0000;
+    --table-header: #c0c0c0;
+    --table-highlight: #e5e4e4;
 
     margin: 0 3%;
     font-family: sans-serif;
@@ -97,12 +99,12 @@ table {
     }
 
     thead {
-        background-color: ButtonFace;
+        background-color: var(--table-header);
     }
 
     tbody {
         tr:hover {
-            background-color: ButtonBorder;
+            background-color: var(--table-highlight);
         }
     }
 }