diff --git a/src/main/java/seedu/address/commons/events/ui/NewResultAvailableEvent.java b/src/main/java/seedu/address/commons/events/ui/NewResultAvailableEvent.java
index a6d5274a97e0..ba21c7ce38ce 100644
--- a/src/main/java/seedu/address/commons/events/ui/NewResultAvailableEvent.java
+++ b/src/main/java/seedu/address/commons/events/ui/NewResultAvailableEvent.java
@@ -8,9 +8,11 @@
 public class NewResultAvailableEvent extends BaseEvent {
 
     public final String message;
+    public final boolean isSuccessful;
 
-    public NewResultAvailableEvent(String message) {
+    public NewResultAvailableEvent(String message, boolean isSuccessful) {
         this.message = message;
+        this.isSuccessful = isSuccessful;
     }
 
     @Override
diff --git a/src/main/java/seedu/address/ui/CommandBox.java b/src/main/java/seedu/address/ui/CommandBox.java
index 3d7aaded5640..eb931ecaa22f 100644
--- a/src/main/java/seedu/address/ui/CommandBox.java
+++ b/src/main/java/seedu/address/ui/CommandBox.java
@@ -107,14 +107,14 @@ private void handleCommandEntered() {
             // process result of the command
             commandTextField.setText("");
             logger.info("Result: " + commandResult.feedbackToUser);
-            raise(new NewResultAvailableEvent(commandResult.feedbackToUser));
+            raise(new NewResultAvailableEvent(commandResult.feedbackToUser, true));
 
         } catch (CommandException | ParseException e) {
             initHistory();
             // handle command failure
             setStyleToIndicateCommandFailure();
             logger.info("Invalid command: " + commandTextField.getText());
-            raise(new NewResultAvailableEvent(e.getMessage()));
+            raise(new NewResultAvailableEvent(e.getMessage(), false));
         }
     }
 
diff --git a/src/main/java/seedu/address/ui/ResultDisplay.java b/src/main/java/seedu/address/ui/ResultDisplay.java
index d05536bbee96..9ebe1037d934 100644
--- a/src/main/java/seedu/address/ui/ResultDisplay.java
+++ b/src/main/java/seedu/address/ui/ResultDisplay.java
@@ -7,6 +7,7 @@
 import javafx.application.Platform;
 import javafx.beans.property.SimpleStringProperty;
 import javafx.beans.property.StringProperty;
+import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.control.TextArea;
 import javafx.scene.layout.Region;
@@ -18,6 +19,8 @@
  */
 public class ResultDisplay extends UiPart<Region> {
 
+    public static final String ERROR_STYLE_CLASS = "error";
+
     private static final Logger logger = LogsCenter.getLogger(ResultDisplay.class);
     private static final String FXML = "ResultDisplay.fxml";
 
@@ -35,7 +38,35 @@ public ResultDisplay() {
     @Subscribe
     private void handleNewResultAvailableEvent(NewResultAvailableEvent event) {
         logger.info(LogsCenter.getEventHandlingLogMessage(event));
-        Platform.runLater(() -> displayed.setValue(event.message));
+        Platform.runLater(() -> {
+            displayed.setValue(event.message);
+
+            if (event.isSuccessful) {
+                setStyleToIndicateCommandSuccess();
+            } else {
+                setStyleToIndicateCommandFailure();
+            }
+        });
+    }
+
+    /**
+     * Sets the {@code ResultDisplay} style to use the default style.
+     */
+    private void setStyleToIndicateCommandSuccess() {
+        resultDisplay.getStyleClass().remove(ERROR_STYLE_CLASS);
+    }
+
+    /**
+     * Sets the {@code ResultDisplay} 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);
     }
 
 }
diff --git a/src/test/java/guitests/guihandles/ResultDisplayHandle.java b/src/test/java/guitests/guihandles/ResultDisplayHandle.java
index ec445e4154ff..0c8bcabe84ea 100644
--- a/src/test/java/guitests/guihandles/ResultDisplayHandle.java
+++ b/src/test/java/guitests/guihandles/ResultDisplayHandle.java
@@ -1,5 +1,7 @@
 package guitests.guihandles;
 
+import java.util.List;
+
 import javafx.scene.control.TextArea;
 
 /**
@@ -19,4 +21,11 @@ public ResultDisplayHandle(TextArea resultDisplayNode) {
     public String getText() {
         return getRootNode().getText();
     }
+
+    /**
+     * Returns the list of style classes present in the result display.
+     */
+    public List<String> getStyleClass() {
+        return getRootNode().getStyleClass();
+    }
 }
diff --git a/src/test/java/seedu/address/ui/CommandBoxTest.java b/src/test/java/seedu/address/ui/CommandBoxTest.java
index f72304570a7a..913f32ba7286 100644
--- a/src/test/java/seedu/address/ui/CommandBoxTest.java
+++ b/src/test/java/seedu/address/ui/CommandBoxTest.java
@@ -1,25 +1,33 @@
 package seedu.address.ui;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
 import java.util.ArrayList;
 
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 
 import guitests.guihandles.CommandBoxHandle;
 import javafx.scene.input.KeyCode;
+import seedu.address.commons.events.ui.NewResultAvailableEvent;
 import seedu.address.logic.Logic;
 import seedu.address.logic.LogicManager;
 import seedu.address.logic.commands.ListCommand;
 import seedu.address.model.Model;
 import seedu.address.model.ModelManager;
+import seedu.address.ui.testutil.EventsCollectorRule;
 
 public class CommandBoxTest extends GuiUnitTest {
 
     private static final String COMMAND_THAT_SUCCEEDS = ListCommand.COMMAND_WORD;
     private static final String COMMAND_THAT_FAILS = "invalid command";
 
+    @Rule
+    public final EventsCollectorRule eventsCollectorRule = new EventsCollectorRule();
+
     private ArrayList<String> defaultStyleOfCommandBox;
     private ArrayList<String> errorStyleOfCommandBox;
 
@@ -127,22 +135,34 @@ public void handleKeyPress_startingWithDown() {
 
     /**
      * Runs a command that fails, then verifies that <br>
+     *      - {@code NewResultAvailableEvent} is posted
      *      - the text remains <br>
      *      - the command box's style is the same as {@code errorStyleOfCommandBox}.
      */
     private void assertBehaviorForFailedCommand() {
         commandBoxHandle.run(COMMAND_THAT_FAILS);
+
+        assertFalse(((NewResultAvailableEvent) eventsCollectorRule.eventsCollector.getMostRecent()).isSuccessful);
+        assertTrue(eventsCollectorRule.eventsCollector.getSize() == 1);
+        eventsCollectorRule.eventsCollector.reset();
+
         assertEquals(COMMAND_THAT_FAILS, commandBoxHandle.getInput());
         assertEquals(errorStyleOfCommandBox, commandBoxHandle.getStyleClass());
     }
 
     /**
      * Runs a command that succeeds, then verifies that <br>
+     *      - {@code NewResultAvailableEvent} is posted
      *      - the text is cleared <br>
      *      - the command box's style is the same as {@code defaultStyleOfCommandBox}.
      */
     private void assertBehaviorForSuccessfulCommand() {
         commandBoxHandle.run(COMMAND_THAT_SUCCEEDS);
+
+        assertTrue(((NewResultAvailableEvent) eventsCollectorRule.eventsCollector.getMostRecent()).isSuccessful);
+        assertTrue(eventsCollectorRule.eventsCollector.getSize() == 1);
+        eventsCollectorRule.eventsCollector.reset();
+
         assertEquals("", commandBoxHandle.getInput());
         assertEquals(defaultStyleOfCommandBox, commandBoxHandle.getStyleClass());
     }
diff --git a/src/test/java/seedu/address/ui/ResultDisplayTest.java b/src/test/java/seedu/address/ui/ResultDisplayTest.java
index acea62615ff4..6c701ec9004a 100644
--- a/src/test/java/seedu/address/ui/ResultDisplayTest.java
+++ b/src/test/java/seedu/address/ui/ResultDisplayTest.java
@@ -3,6 +3,9 @@
 import static org.junit.Assert.assertEquals;
 import static seedu.address.testutil.EventsUtil.postNow;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.junit.Before;
 import org.junit.Test;
 
@@ -11,7 +14,14 @@
 
 public class ResultDisplayTest extends GuiUnitTest {
 
-    private static final NewResultAvailableEvent NEW_RESULT_EVENT_STUB = new NewResultAvailableEvent("Stub");
+    private static final NewResultAvailableEvent NEW_RESULT_SUCCESS_EVENT_STUB =
+            new NewResultAvailableEvent("success", true);
+
+    private static final NewResultAvailableEvent NEW_RESULT_FAILURE_EVENT_STUB =
+            new NewResultAvailableEvent("failure", false);
+
+    private List<String> defaultStyleOfResultDisplay;
+    private List<String> errorStyleOfResultDisplay;
 
     private ResultDisplayHandle resultDisplayHandle;
 
@@ -22,6 +32,11 @@ public void setUp() {
 
         resultDisplayHandle = new ResultDisplayHandle(getChildNode(resultDisplay.getRoot(),
                 ResultDisplayHandle.RESULT_DISPLAY_ID));
+
+        defaultStyleOfResultDisplay = new ArrayList<>(resultDisplayHandle.getStyleClass());
+
+        errorStyleOfResultDisplay = new ArrayList<>(defaultStyleOfResultDisplay);
+        errorStyleOfResultDisplay.add(ResultDisplay.ERROR_STYLE_CLASS);
     }
 
     @Test
@@ -29,10 +44,26 @@ public void display() {
         // default result text
         guiRobot.pauseForHuman();
         assertEquals("", resultDisplayHandle.getText());
+        assertEquals(defaultStyleOfResultDisplay, resultDisplayHandle.getStyleClass());
 
-        // new result received
-        postNow(NEW_RESULT_EVENT_STUB);
+        // receiving new results
+        assertResultDisplay(NEW_RESULT_SUCCESS_EVENT_STUB);
+        assertResultDisplay(NEW_RESULT_FAILURE_EVENT_STUB);
+    }
+
+    /**
+     * Posts the {@code event} to the {@code EventsCenter}, then verifies that <br>
+     *      - the text on the result display matches the {@code event}'s message <br>
+     *      - the result display's style is the same as {@code defaultStyleOfResultDisplay} if event is successful,
+     *        {@code errorStyleOfResultDisplay} otherwise.
+     */
+    private void assertResultDisplay(NewResultAvailableEvent event) {
+        postNow(event);
         guiRobot.pauseForHuman();
-        assertEquals(NEW_RESULT_EVENT_STUB.message, resultDisplayHandle.getText());
+
+        List<String> expectedStyleClass = event.isSuccessful ? defaultStyleOfResultDisplay : errorStyleOfResultDisplay;
+
+        assertEquals(event.message, resultDisplayHandle.getText());
+        assertEquals(expectedStyleClass, resultDisplayHandle.getStyleClass());
     }
 }
diff --git a/src/test/java/systemtests/AddCommandSystemTest.java b/src/test/java/systemtests/AddCommandSystemTest.java
index 4dee13251f3f..56958359d33f 100644
--- a/src/test/java/systemtests/AddCommandSystemTest.java
+++ b/src/test/java/systemtests/AddCommandSystemTest.java
@@ -229,7 +229,7 @@ private void assertCommandSuccess(String command, Model expectedModel, String ex
         executeCommand(command);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         assertStatusBarUnchangedExceptSyncStatus();
     }
 
@@ -250,7 +250,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         executeCommand(command);
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsErrorStyle();
+        assertCommandBoxAndResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/AddressBookSystemTest.java b/src/test/java/systemtests/AddressBookSystemTest.java
index 986c82360359..457b4cf064a4 100644
--- a/src/test/java/systemtests/AddressBookSystemTest.java
+++ b/src/test/java/systemtests/AddressBookSystemTest.java
@@ -43,6 +43,7 @@
 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
@@ -56,6 +57,9 @@ public abstract class AddressBookSystemTest {
     private static final List<String> COMMAND_BOX_ERROR_STYLE =
             Arrays.asList("text-input", "text-field", CommandBox.ERROR_STYLE_CLASS);
 
+    private List<String> defaultStyleOfResultDisplay;
+    private List<String> errorStyleOfResultDisplay;
+
     private MainWindowHandle mainWindowHandle;
     private TestApp testApp;
     private SystemTestSetupHelper setupHelper;
@@ -71,6 +75,11 @@ public void setUp() {
         testApp = setupHelper.setupApplication(this::getInitialData, getDataFileLocation());
         mainWindowHandle = setupHelper.setupMainWindowHandle();
 
+        defaultStyleOfResultDisplay = mainWindowHandle.getResultDisplay().getStyleClass();
+
+        errorStyleOfResultDisplay = mainWindowHandle.getResultDisplay().getStyleClass();
+        errorStyleOfResultDisplay.add(ResultDisplay.ERROR_STYLE_CLASS);
+
         waitUntilBrowserLoaded(getBrowserPanel());
         assertApplicationStartingStateIsCorrect();
     }
@@ -236,17 +245,19 @@ protected void assertSelectedCardUnchanged() {
     }
 
     /**
-     * Asserts that the command box's shows the default style.
+     * Asserts that the command box and result display shows the default style.
      */
-    protected void assertCommandBoxShowsDefaultStyle() {
+    protected void assertCommandBoxAndResultDisplayShowsDefaultStyle() {
         assertEquals(COMMAND_BOX_DEFAULT_STYLE, getCommandBox().getStyleClass());
+        assertEquals(defaultStyleOfResultDisplay, getResultDisplay().getStyleClass());
     }
 
     /**
-     * Asserts that the command box's shows the error style.
+     * Asserts that the command box and result display shows the error style.
      */
-    protected void assertCommandBoxShowsErrorStyle() {
+    protected void assertCommandBoxAndResultDisplayShowsErrorStyle() {
         assertEquals(COMMAND_BOX_ERROR_STYLE, getCommandBox().getStyleClass());
+        assertEquals(errorStyleOfResultDisplay, getResultDisplay().getStyleClass());
     }
 
     /**
diff --git a/src/test/java/systemtests/ClearCommandSystemTest.java b/src/test/java/systemtests/ClearCommandSystemTest.java
index 805a59784e29..d90c73736bba 100644
--- a/src/test/java/systemtests/ClearCommandSystemTest.java
+++ b/src/test/java/systemtests/ClearCommandSystemTest.java
@@ -76,7 +76,7 @@ private void assertCommandSuccess(String command) {
     private void assertCommandSuccess(String command, String expectedResultMessage, Model expectedModel) {
         executeCommand(command);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         assertStatusBarUnchangedExceptSyncStatus();
     }
 
@@ -95,7 +95,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         executeCommand(command);
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsErrorStyle();
+        assertCommandBoxAndResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/DeleteCommandSystemTest.java b/src/test/java/systemtests/DeleteCommandSystemTest.java
index 97d42add1209..8eea181dc193 100644
--- a/src/test/java/systemtests/DeleteCommandSystemTest.java
+++ b/src/test/java/systemtests/DeleteCommandSystemTest.java
@@ -172,7 +172,7 @@ private void assertCommandSuccess(String command, Model expectedModel, String ex
             assertSelectedCardUnchanged();
         }
 
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         assertStatusBarUnchangedExceptSyncStatus();
     }
 
@@ -192,7 +192,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         executeCommand(command);
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsErrorStyle();
+        assertCommandBoxAndResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/EditCommandSystemTest.java b/src/test/java/systemtests/EditCommandSystemTest.java
index 38d82c61aaf0..73b273b9ee8d 100644
--- a/src/test/java/systemtests/EditCommandSystemTest.java
+++ b/src/test/java/systemtests/EditCommandSystemTest.java
@@ -276,7 +276,7 @@ private void assertCommandSuccess(String command, Model expectedModel, String ex
         executeCommand(command);
         expectedModel.updateFilteredPersonList(PREDICATE_SHOW_ALL_PERSONS);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         if (expectedSelectedCardIndex != null) {
             assertSelectedCardChanged(expectedSelectedCardIndex);
         } else {
@@ -301,7 +301,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         executeCommand(command);
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsErrorStyle();
+        assertCommandBoxAndResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/FindCommandSystemTest.java b/src/test/java/systemtests/FindCommandSystemTest.java
index 0bde83c0444b..12b69232afb6 100644
--- a/src/test/java/systemtests/FindCommandSystemTest.java
+++ b/src/test/java/systemtests/FindCommandSystemTest.java
@@ -170,7 +170,7 @@ private void assertCommandSuccess(String command, Model expectedModel) {
 
         executeCommand(command);
         assertApplicationDisplaysExpected("", expectedResultMessage, expectedModel);
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         assertStatusBarUnchanged();
     }
 
@@ -189,7 +189,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         executeCommand(command);
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsErrorStyle();
+        assertCommandBoxAndResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }
diff --git a/src/test/java/systemtests/HelpCommandSystemTest.java b/src/test/java/systemtests/HelpCommandSystemTest.java
index 3fa0cc98236e..cb249e39c1c0 100644
--- a/src/test/java/systemtests/HelpCommandSystemTest.java
+++ b/src/test/java/systemtests/HelpCommandSystemTest.java
@@ -62,7 +62,7 @@ public void openHelpWindow() {
         // assert that while the help window is open the UI updates correctly for a command execution
         executeCommand(SelectCommand.COMMAND_WORD + " " + INDEX_FIRST_PERSON.getOneBased());
         assertEquals("", getCommandBox().getInput());
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         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 aaacea0120f2..5f44b5399ce2 100644
--- a/src/test/java/systemtests/SelectCommandSystemTest.java
+++ b/src/test/java/systemtests/SelectCommandSystemTest.java
@@ -126,7 +126,7 @@ private void assertCommandSuccess(String command, Index expectedSelectedCardInde
             assertSelectedCardChanged(expectedSelectedCardIndex);
         }
 
-        assertCommandBoxShowsDefaultStyle();
+        assertCommandBoxAndResultDisplayShowsDefaultStyle();
         assertStatusBarUnchanged();
     }
 
@@ -147,7 +147,7 @@ private void assertCommandFailure(String command, String expectedResultMessage)
         executeCommand(command);
         assertApplicationDisplaysExpected(command, expectedResultMessage, expectedModel);
         assertSelectedCardUnchanged();
-        assertCommandBoxShowsErrorStyle();
+        assertCommandBoxAndResultDisplayShowsErrorStyle();
         assertStatusBarUnchanged();
     }
 }