diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 16ba597..2b02e7a 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -71,19 +71,19 @@ export class AppComponent implements OnInit {
     );
     this.hotKeysService.addShortcut({ keys: 'Space' }).subscribe(_ =>
       {
-        if (this.state.displayMode != DisplayMode.Presentation) {
+        if (this.state.displayMode !== DisplayMode.Presentation) {
           this.showDisplay();
         }
       }
     );
     this.hotKeysService.addShortcut({ keys: 't' }).subscribe(_ =>
-      this.state.displayMode == DisplayMode.Theme ? this.showDisplay() : this.themeDisplay()
+      this.state.displayMode === DisplayMode.Theme ? this.showDisplay() : this.themeDisplay()
     );
     this.hotKeysService.addShortcut({ keys: 'code.Period' }).subscribe(_ =>
-      this.state.displayMode == DisplayMode.Blank ? this.showDisplay() : this.blankDisplay()
+      this.state.displayMode === DisplayMode.Blank ? this.showDisplay() : this.blankDisplay()
     );
     this.hotKeysService.addShortcut({ keys: 'd' }).subscribe(_ =>
-      this.state.displayMode == DisplayMode.Desktop ? this.showDisplay() : this.desktopDisplay()
+      this.state.displayMode === DisplayMode.Desktop ? this.showDisplay() : this.desktopDisplay()
     );
   }
 
diff --git a/src/app/hotkeys.service.ts b/src/app/hotkeys.service.ts
index b1112cc..d90596d 100644
--- a/src/app/hotkeys.service.ts
+++ b/src/app/hotkeys.service.ts
@@ -1,18 +1,18 @@
-import { DOCUMENT } from "@angular/common";
-import { Inject, Injectable } from "@angular/core";
-import { EventManager } from "@angular/platform-browser";
-import { Observable } from "rxjs";
+import { DOCUMENT } from '@angular/common';
+import { Inject, Injectable } from '@angular/core';
+import { EventManager } from '@angular/platform-browser';
+import { Observable } from 'rxjs';
 
-type Options = {
+interface Options {
   element: any;
   keys: string;
-}
+};
 
 @Injectable({ providedIn: 'root' })
 export class HotKeysService {
   defaults: Partial<Options> = {
     element: this.document
-  }
+  };
 
   constructor(private eventManager: EventManager, @Inject(DOCUMENT) private document: Document) {
   }
@@ -25,7 +25,7 @@ export class HotKeysService {
       const handler = (e: KeyboardEvent) => {
         if (document.URL.endsWith('/slides'))
         {
-          e.preventDefault()
+          e.preventDefault();
           observer.next(e);
         }
       };
@@ -37,6 +37,6 @@ export class HotKeysService {
       return () => {
         dispose();
       };
-    })
+    });
   }
-}
\ No newline at end of file
+}