FIX: Fixed the on hover behaviour of the two plus buttons in the Input Actions Editor window (#2158)

Author: K-Tone

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -14,6 +14,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed an analytics event being invoked twice when the Save button in the Actions view was pressed. [ISXB-1378](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1378)
 - Fixed an issue causing a number of errors to be displayed when using `InputTestFixture` in playmode tests with domain reloading disabled on playmode entry. [ISXB-1446](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1446)
 - Fixed issue where user was not prompted to save changes when loading a second input actions asset into an already opened editor. [ISXB-1343](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1343)
+- Fixed the on hover behaviour of the two plus buttons in the Input Actions Editor window [ISXB-1327](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1327)
 - Fixed an issue on macOS which didn't detect up-left DPAD presses for Xbox controllers. [ISXB-810](https://issuetracker.unity3d.com/issues/macos-d-pad-upper-left-corner-is-not-logged-with-the-xbox-controller)
 - Fixed an issue when providing JoinPlayer with a specific split screen index. [ISXB-897](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-897)
 

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/PackageResources/InputActionsEditorStyles.uss

@@ -30,12 +30,10 @@
 }
 
 #add-new-action-map-button {
-    background-color: transparent;
     border-width: 0;
 }
 
 #add-new-action-button {
-    background-color: transparent;
     border-width: 0;
 }