Clean up scenarios; move some styles into .css files

public/assets/css/map.css

@@ -44,7 +44,8 @@ polyline.move-trace {
 }
 
 #background {
-  /* fill: #bacae3; */
+  stroke: #304b75;
+  fill: #bacae3;
 }
 
 g.troop-counter, g.counter, g.troop-counter use {
@@ -199,6 +200,11 @@ g.selected use.primary-weapon {
   r: 6px;
 }
 
+pattern use {
+  stroke: black;
+  stroke-width: 0.3px;
+}
+
 @keyframes selected {
   50% {
     stroke-width: 0px;

public/assets/css/style.css

@@ -56,10 +56,6 @@ g#grid {
   transform: translate(19px, 31px) scale(4);
 }
 
-#background {
-  fill: #bacae3;
-}
-
 #panel {
   display: none;
   position: absolute;