Move new changes to the scss file

Move the new code for the settings cog to the scss file rather than the
css directoly and then let scss fill the css file.

css/main.css

@@ -158,8 +158,6 @@ body {
   height: 48px;
   position: absolute;
   bottom: 25px;
-  right: 25px; 
-}
-.cog:hover {
-    fill: white;
-  }
+  right: 25px; }
+  #settings-cog .cog:hover {
+    fill: white; }

scss/main.scss

@@ -251,4 +251,16 @@ body {
             cursor: pointer;
             }
       }
+}
+
+#settings-cog {
+    width: 48px;
+    height: 48px;
+    position: absolute;
+    bottom: 25px;
+    right: 25px; 
+
+    .cog:hover {
+        fill: white;
+    }
 }