diff --git a/src/component/internal/connection.ts b/src/component/internal/connection.ts
index 50e33404..e195aaf9 100644
--- a/src/component/internal/connection.ts
+++ b/src/component/internal/connection.ts
@@ -7,11 +7,11 @@ import { NekoWebSocket } from './websocket'
 import { NekoWebRTC, WebRTCStats } from './webrtc'
 import { Connection } from '../types/state'
 
-const websocketTimer = 1000
-const websocketReconnDelay = 750
+const WEBSOCKET_TIMEOUT = 1000
+const WEBSOCKET_RECONN_DELAY = 750
 
-const webrtcTimer = 10000
-const webrtcReconnDelay = 750
+const WEBRTC_TIMEOUT = 10000
+const WEBRTC_RECONN_DELAY = 750
 
 export interface NekoConnectionEvents {
   disconnect: (error?: Error) => void
@@ -154,7 +154,7 @@ export class NekoConnection extends EventEmitter<NekoConnectionEvents> {
       const timeout = window.setTimeout(() => {
         this.websocket.disconnect()
         rej(new Error('timeouted'))
-      }, websocketTimer)
+      }, WEBSOCKET_TIMEOUT)
       this.websocket.once('connected', () => {
         window.clearTimeout(timeout)
         res()
@@ -188,7 +188,7 @@ export class NekoConnection extends EventEmitter<NekoConnectionEvents> {
 
       this._websocketIsReconnecting = false
       this._log.debug(`websocket reconnection finished`)
-    }, websocketReconnDelay)
+    }, WEBSOCKET_RECONN_DELAY)
   }
 
   async _webrtcConnect(video?: string) {
@@ -203,7 +203,7 @@ export class NekoConnection extends EventEmitter<NekoConnectionEvents> {
       const timeout = window.setTimeout(() => {
         this.webrtc.disconnect()
         rej(new Error('timeouted'))
-      }, webrtcTimer)
+      }, WEBRTC_TIMEOUT)
       this.webrtc.once('connected', () => {
         window.clearTimeout(timeout)
         res()
@@ -241,7 +241,7 @@ export class NekoConnection extends EventEmitter<NekoConnectionEvents> {
 
       this._webrtcIsReconnecting = false
       this._log.debug(`webrtc reconnection finished`)
-    }, webrtcReconnDelay)
+    }, WEBRTC_RECONN_DELAY)
   }
 
   _webrtcQualityDowngrade(quality: string): string | undefined {
diff --git a/src/component/overlay.vue b/src/component/overlay.vue
index 21eafad2..d66c287b 100644
--- a/src/component/overlay.vue
+++ b/src/component/overlay.vue
@@ -39,7 +39,7 @@
   import { NekoWebRTC } from './internal/webrtc'
   import { Scroll } from './types/state'
 
-  const inactiveCursorWin10 =
+  const INACTIVE_CURSOR =
     'url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAACEUlEQVR4nOzWz6sSURQH8O+89zJ5C32LKbAgktCSaPpBSL' +
     'uSNtHqLcOV+BeIGxei0oCtFME/wI0bF4GCK6mNuAghH7xFlBAO7bQoA/Vik3riyghTaCQzTsLzbIZZDPdzzj3nzt3Df44dYDsBRNSYTqcn5XL5KoADy1VERL' +
     'Is02g0+phIJG4BsFkOEEVxjhgOh59kWb5rKWIBWCAGg0EnFovdtgyhB+grkU6n7wA4ZzlgCWKzlVgGsLQnVgE2gVh7xvP5PH9ciUajFQDHyWTyHQDVKOS3+F' +
@@ -84,7 +84,7 @@
 
     get cursor(): string {
       if (!this.isControling) {
-        return inactiveCursorWin10
+        return INACTIVE_CURSOR
       }
 
       if (!this.cursorImage) {