diff --git a/src/main/java/seedu/address/ui/MainWindow.java b/src/main/java/seedu/address/ui/MainWindow.java
index ac165736001d..74864bce2346 100644
--- a/src/main/java/seedu/address/ui/MainWindow.java
+++ b/src/main/java/seedu/address/ui/MainWindow.java
@@ -181,7 +181,7 @@ private CommandResult executeCommand(String commandText) throws CommandException
         try {
             CommandResult commandResult = logic.execute(commandText);
             logger.info("Result: " + commandResult.getFeedbackToUser());
-            resultDisplay.setFeedbackToUser(commandResult.getFeedbackToUser());
+            resultDisplay.setFeedbackSuccessToUser(commandResult.getFeedbackToUser());
 
             if (commandResult.isShowHelp()) {
                 handleHelp();
@@ -194,7 +194,7 @@ private CommandResult executeCommand(String commandText) throws CommandException
             return commandResult;
         } catch (CommandException | ParseException e) {
             logger.info("Invalid command: " + commandText);
-            resultDisplay.setFeedbackToUser(e.getMessage());
+            resultDisplay.setFeedbackErrorToUser(e.getMessage());
             throw e;
         }
     }
diff --git a/src/main/java/seedu/address/ui/ResultDisplay.java b/src/main/java/seedu/address/ui/ResultDisplay.java
index 7d98e84eedf0..b3225fb05858 100644
--- a/src/main/java/seedu/address/ui/ResultDisplay.java
+++ b/src/main/java/seedu/address/ui/ResultDisplay.java
@@ -2,6 +2,7 @@
 
 import static java.util.Objects.requireNonNull;
 
+import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.TextArea;
 import javafx.scene.layout.Region;
@@ -11,6 +12,8 @@
  */
 public class ResultDisplay extends UiPart<Region> {
 
+    public static final String ERROR_STYLE_CLASS = "error";
+
     private static final String FXML = "ResultDisplay.fxml";
 
     @FXML
@@ -20,7 +23,34 @@ public ResultDisplay() {
         super(FXML);
     }
 
-    public void setFeedbackToUser(String feedbackToUser) {
+    /**
+     * Sets the command box style to use the default style.
+     */
+    private void setStyleToDefault() {
+        resultDisplay.getStyleClass().remove(ERROR_STYLE_CLASS);
+    }
+
+    /**
+     * Sets the command box style to indicate a failed command.
+     */
+    private void setStyleToIndicateCommandFailure() {
+        ObservableList<String> styleClass = resultDisplay.getStyleClass();
+
+        if (styleClass.contains(ERROR_STYLE_CLASS)) {
+            return;
+        }
+
+        styleClass.add(ERROR_STYLE_CLASS);
+    }
+
+    public void setFeedbackErrorToUser(String feedbackToUser) {
+        setStyleToIndicateCommandFailure();
+        requireNonNull(feedbackToUser);
+        resultDisplay.setText(feedbackToUser);
+    }
+
+    public void setFeedbackSuccessToUser(String feedbackToUser) {
+        setStyleToDefault();
         requireNonNull(feedbackToUser);
         resultDisplay.setText(feedbackToUser);
     }
diff --git a/src/test/java/guitests/guihandles/ResultDisplayHandle.java b/src/test/java/guitests/guihandles/ResultDisplayHandle.java
index ec445e4154ff..f5a4f9e720d8 100644
--- a/src/test/java/guitests/guihandles/ResultDisplayHandle.java
+++ b/src/test/java/guitests/guihandles/ResultDisplayHandle.java
@@ -1,5 +1,6 @@
 package guitests.guihandles;
 
+import javafx.collections.ObservableList;
 import javafx.scene.control.TextArea;
 
 /**
@@ -19,4 +20,11 @@ public ResultDisplayHandle(TextArea resultDisplayNode) {
     public String getText() {
         return getRootNode().getText();
     }
+
+    /**
+     * Returns the list of style classes present in the command box.
+     */
+    public ObservableList<String> getStyleClass() {
+        return getRootNode().getStyleClass();
+    }
 }
diff --git a/src/test/java/seedu/address/ui/ResultDisplayTest.java b/src/test/java/seedu/address/ui/ResultDisplayTest.java
index 23a47b651881..fb8b5f5c0bb5 100644
--- a/src/test/java/seedu/address/ui/ResultDisplayTest.java
+++ b/src/test/java/seedu/address/ui/ResultDisplayTest.java
@@ -2,6 +2,8 @@
 
 import static org.junit.Assert.assertEquals;
 
+import java.util.ArrayList;
+
 import org.junit.Before;
 import org.junit.Test;
 
@@ -12,6 +14,9 @@ public class ResultDisplayTest extends GuiUnitTest {
     private ResultDisplay resultDisplay;
     private ResultDisplayHandle resultDisplayHandle;
 
+    private ArrayList<String> defaultStyleOfResultDisplay;
+    private ArrayList<String> errorStyleOfResultDisplay;
+
     @Before
     public void setUp() {
         resultDisplay = new ResultDisplay();
@@ -19,17 +24,82 @@ public void setUp() {
 
         resultDisplayHandle = new ResultDisplayHandle(getChildNode(resultDisplay.getRoot(),
                 ResultDisplayHandle.RESULT_DISPLAY_ID));
+
+        defaultStyleOfResultDisplay = new ArrayList<>(resultDisplayHandle.getStyleClass());
+
+        errorStyleOfResultDisplay = new ArrayList<>(defaultStyleOfResultDisplay);
+        errorStyleOfResultDisplay.add(CommandBox.ERROR_STYLE_CLASS);
     }
 
     @Test
-    public void display() {
+    public void defaultDisplay_emptyDisplay() {
         // default result text
         guiRobot.pauseForHuman();
         assertEquals("", resultDisplayHandle.getText());
+    }
 
-        // new result received
-        guiRobot.interact(() -> resultDisplay.setFeedbackToUser("Dummy feedback to user"));
+    @Test
+    public void emptyFeedback_emptyDisplay() {
+        guiRobot.interact(() -> resultDisplay.setFeedbackSuccessToUser(""));
+        guiRobot.pauseForHuman();
+        assertEquals("", resultDisplayHandle.getText());
+        assertEquals(defaultStyleOfResultDisplay, resultDisplayHandle.getStyleClass());
+    }
+
+    @Test
+    public void successfulFeedback() {
+        guiRobot.interact(() -> resultDisplay.setFeedbackSuccessToUser("Dummy feedback to user"));
         guiRobot.pauseForHuman();
         assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForSuccessfulFeedback(resultDisplayHandle);
+    }
+
+    @Test
+    public void errorFeedback() {
+        guiRobot.interact(() -> resultDisplay.setFeedbackErrorToUser("Dummy feedback to user"));
+        guiRobot.pauseForHuman();
+        assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForErrorFeedback(resultDisplayHandle);
+    }
+
+    @Test
+    public void consecutiveFeedBack() {
+        // new error result received
+        guiRobot.interact(() -> resultDisplay.setFeedbackErrorToUser("Dummy feedback to user"));
+        guiRobot.pauseForHuman();
+        assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForErrorFeedback(resultDisplayHandle);
+
+        // new error result received
+        guiRobot.interact(() -> resultDisplay.setFeedbackErrorToUser("Dummy feedback to user"));
+        guiRobot.pauseForHuman();
+        assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForErrorFeedback(resultDisplayHandle);
+
+        // new success result received
+        guiRobot.interact(() -> resultDisplay.setFeedbackSuccessToUser("Dummy feedback to user"));
+        guiRobot.pauseForHuman();
+        assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForSuccessfulFeedback(resultDisplayHandle);
+
+        // new success result received
+        guiRobot.interact(() -> resultDisplay.setFeedbackSuccessToUser("Dummy feedback to user"));
+        guiRobot.pauseForHuman();
+        assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForSuccessfulFeedback(resultDisplayHandle);
+
+        // new error result received
+        guiRobot.interact(() -> resultDisplay.setFeedbackErrorToUser("Dummy feedback to user"));
+        guiRobot.pauseForHuman();
+        assertEquals("Dummy feedback to user", resultDisplayHandle.getText());
+        assertStyleForErrorFeedback(resultDisplayHandle);
+    }
+
+    private void assertStyleForSuccessfulFeedback(ResultDisplayHandle resultDisplayHandle) {
+        assertEquals(defaultStyleOfResultDisplay, resultDisplayHandle.getStyleClass());
+    }
+
+    private void assertStyleForErrorFeedback(ResultDisplayHandle resultDisplayHandle) {
+        assertEquals(errorStyleOfResultDisplay, resultDisplayHandle.getStyleClass());
     }
 }
diff --git a/src/test/java/systemtests/AddCommandSystemTest.java b/src/test/java/systemtests/AddCommandSystemTest.java
index b7e5e2d23a4e..c835684afe47 100644
--- a/src/test/java/systemtests/AddCommandSystemTest.java
+++ b/src/test/java/systemtests/AddCommandSystemTest.java
@@ -229,6 +229,7 @@ private void assertCommandSuccess(String command, Model expectedModel, String ex
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         assertStatusBarUnchangedExceptSyncStatus();
     }
 
@@ -250,6 +251,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsErrorStyle();
+        assertResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/AddressBookSystemTest.java b/src/test/java/systemtests/AddressBookSystemTest.java
index 0baeaf860e6e..3bc9c5d09157 100644
--- a/src/test/java/systemtests/AddressBookSystemTest.java
+++ b/src/test/java/systemtests/AddressBookSystemTest.java
@@ -39,6 +39,7 @@
 import seedu.address.testutil.TypicalPersons;
 import seedu.address.ui.BrowserPanel;
 import seedu.address.ui.CommandBox;
+import seedu.address.ui.ResultDisplay;
 
 /**
  * A system test class for AddressBook, which provides access to handles of GUI components and helper methods
@@ -52,6 +53,12 @@ public abstract class AddressBookSystemTest {
     private static final List<String> COMMAND_BOX_ERROR_STYLE =
             Arrays.asList("text-input", "text-field", CommandBox.ERROR_STYLE_CLASS);
 
+    private static final List<String> RESULT_DISPLAY_DEFAULT_STYLE = Arrays.asList("text-input",
+                                                                                   "text-area",
+                                                                                   "result-display");
+    private static final List<String> RESULT_DISPLAY_ERROR_STYLE =
+            Arrays.asList("text-input", "text-area", "result-display", ResultDisplay.ERROR_STYLE_CLASS);
+
     private MainWindowHandle mainWindowHandle;
     private TestApp testApp;
     private SystemTestSetupHelper setupHelper;
@@ -231,19 +238,33 @@ protected void assertSelectedCardUnchanged() {
     }
 
     /**
-     * Asserts that the command box's shows the default style.
+     * Asserts that the command box shows the default style.
      */
     protected void assertCommandBoxShowsDefaultStyle() {
         assertEquals(COMMAND_BOX_DEFAULT_STYLE, getCommandBox().getStyleClass());
     }
 
     /**
-     * Asserts that the command box's shows the error style.
+     * Asserts that the command box shows the error style.
      */
     protected void assertCommandBoxShowsErrorStyle() {
         assertEquals(COMMAND_BOX_ERROR_STYLE, getCommandBox().getStyleClass());
     }
 
+    /**
+     * Asserts that the result display shows the default style.
+     */
+    protected void assertResultDisplayShowsDefaultStyle() {
+        assertEquals(RESULT_DISPLAY_DEFAULT_STYLE, getResultDisplay().getStyleClass());
+    }
+
+    /**
+     * Asserts that the result display shows the error style.
+     */
+    protected void assertResultDisplayShowsErrorStyle() {
+        assertEquals(RESULT_DISPLAY_ERROR_STYLE, getResultDisplay().getStyleClass());
+    }
+
     /**
      * Asserts that the entire status bar remains the same.
      */
diff --git a/src/test/java/systemtests/ClearCommandSystemTest.java b/src/test/java/systemtests/ClearCommandSystemTest.java
index fb01059d9fe4..d439d6ab2d34 100644
--- a/src/test/java/systemtests/ClearCommandSystemTest.java
+++ b/src/test/java/systemtests/ClearCommandSystemTest.java
@@ -77,6 +77,7 @@ private void assertCommandSuccess(String command, String expectedResultMessage,
         executeCommand(command);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         assertStatusBarUnchangedExceptSyncStatus();
     }
 
@@ -96,6 +97,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsErrorStyle();
+        assertResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/DeleteCommandSystemTest.java b/src/test/java/systemtests/DeleteCommandSystemTest.java
index 29fbb5fc3930..9b5f6d477fd8 100644
--- a/src/test/java/systemtests/DeleteCommandSystemTest.java
+++ b/src/test/java/systemtests/DeleteCommandSystemTest.java
@@ -168,6 +168,7 @@ private void assertCommandSuccess(String command, Model expectedModel, String ex
         }
 
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         assertStatusBarUnchangedExceptSyncStatus();
     }
 
@@ -188,6 +189,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsErrorStyle();
+        assertResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/EditCommandSystemTest.java b/src/test/java/systemtests/EditCommandSystemTest.java
index 5046250c0016..65c683f62557 100644
--- a/src/test/java/systemtests/EditCommandSystemTest.java
+++ b/src/test/java/systemtests/EditCommandSystemTest.java
@@ -268,6 +268,7 @@ private void assertCommandSuccess(String command, Model expectedModel, String ex
         expectedModel.updateFilteredPersonList(PREDICATE_SHOW_ALL_PERSONS);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         if (expectedSelectedCardIndex != null) {
             assertSelectedCardChanged(expectedSelectedCardIndex);
         } else {
@@ -293,6 +294,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsErrorStyle();
+        assertResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/FindCommandSystemTest.java b/src/test/java/systemtests/FindCommandSystemTest.java
index 0bde83c0444b..6ab8c9bee035 100644
--- a/src/test/java/systemtests/FindCommandSystemTest.java
+++ b/src/test/java/systemtests/FindCommandSystemTest.java
@@ -171,6 +171,7 @@ private void assertCommandSuccess(String command, Model expectedModel) {
         executeCommand(command);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         assertStatusBarUnchanged();
     }
 
@@ -190,6 +191,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsErrorStyle();
+        assertResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/HelpCommandSystemTest.java b/src/test/java/systemtests/HelpCommandSystemTest.java
index 3fa0cc98236e..73e8b603f434 100644
--- a/src/test/java/systemtests/HelpCommandSystemTest.java
+++ b/src/test/java/systemtests/HelpCommandSystemTest.java
@@ -63,6 +63,7 @@ public void openHelpWindow() {
         executeCommand(SelectCommand.COMMAND_WORD + " " + INDEX_FIRST_PERSON.getOneBased());
         assertEquals("", getCommandBox().getInput());
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         assertNotEquals(HelpCommand.SHOWING_HELP_MESSAGE, getResultDisplay().getText());
         assertNotEquals(BrowserPanel.DEFAULT_PAGE, getBrowserPanel().getLoadedUrl());
         assertListMatching(getPersonListPanel(), getModel().getFilteredPersonList());
diff --git a/src/test/java/systemtests/SelectCommandSystemTest.java b/src/test/java/systemtests/SelectCommandSystemTest.java
index 68d024c22e64..35349fd10cb1 100644
--- a/src/test/java/systemtests/SelectCommandSystemTest.java
+++ b/src/test/java/systemtests/SelectCommandSystemTest.java
@@ -128,6 +128,7 @@ private void assertCommandSuccess(String command, Index expectedSelectedCardInde
         }
 
         assertCommandBoxShowsDefaultStyle();
+        assertResultDisplayShowsDefaultStyle();
         assertStatusBarUnchanged();
     }
 
@@ -149,6 +150,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
         assertCommandBoxShowsErrorStyle();
+        assertResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }