css improvements

web/src/main/resources/web/css/default.css

@@ -4,6 +4,7 @@ a {
 body {
     background: black;
     color: orange;
+    margin: 0;
 }
 
 fieldset {
@@ -35,6 +36,14 @@ footer {
   text-align: center;
   margin: 5px;
 }
+nav {
+  position: sticky;
+  top: 0;
+  background: #26220c;
+  padding: 5px;
+  margin: 0 0 10px 0;
+  border-bottom: 1px solid orange;
+}
 .error {
   background: red;
   color: black;