Skilling Calculators Plugin design tweak

Prepared it for release, still to be redesigned.

Changes:
- Changed the background color on some panels to match the new ui
- Re-ordered the plugin to a lower position on the side bar

runelite-client/src/main/java/net/runelite/client/plugins/skillcalculator/SkillCalculatorPanel.java

@@ -38,6 +38,7 @@ import javax.swing.JButton;
 import javax.swing.JPanel;
 import net.runelite.api.Client;
 import net.runelite.client.game.SkillIconManager;
+import net.runelite.client.ui.ColorScheme;
 import net.runelite.client.ui.PluginPanel;
 
 class SkillCalculatorPanel extends PluginPanel
@@ -64,10 +65,13 @@ class SkillCalculatorPanel extends PluginPanel
 		uiButtonGridConstraints.insets = new Insets(2, 2, 2, 2);
 
 		uiButtonGrid.setLayout(uiButtonGridLayout);
+		uiButtonGrid.setBackground(ColorScheme.DARK_GRAY_COLOR);
 		uiButtonGrid.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
 		addCalculatorButtons();
 
 		final UICalculatorInputArea uiInput = new UICalculatorInputArea();
+		uiInput.setBackground(ColorScheme.DARK_GRAY_COLOR);
+
 		uiCalculator = new SkillCalculator(client, uiInput);
 
 		add(uiButtonGrid);

runelite-client/src/main/java/net/runelite/client/plugins/skillcalculator/SkillCalculatorPlugin.java

@@ -75,7 +75,12 @@ public class SkillCalculatorPlugin extends Plugin
 		SkillCalculator.itemManager = itemManager;
 
 		uiPanel = new SkillCalculatorPanel(skillIconManager, client);
-		uiNavigationButton = NavigationButton.builder().name("Skill Calculator").icon(icon).panel(uiPanel).build();
+		uiNavigationButton = NavigationButton.builder()
+			.name("Skill Calculator")
+			.icon(icon)
+			.priority(6)
+			.panel(uiPanel)
+			.build();
 		pluginToolbar.addNavigation(uiNavigationButton);
 	}