diff --git a/web/assets/css/game.css b/web/assets/css/game.css
index 34f8cac..0e10d46 100644
--- a/web/assets/css/game.css
+++ b/web/assets/css/game.css
@@ -54,12 +54,10 @@ body {
     justify-content: center;
     margin: 0;
     position: relative;
-    background-color: #2a2a2a;
 }
 
 .empty {
     background-color: #DADEEF;
-    border-color: #333333;
 }
 
 .empty:hover {
@@ -77,8 +75,6 @@ body {
 }
 
 .mirror {
-    background-color: #1a1a1a;
-    border-color: #444444;
     position: relative;
     overflow: hidden;
 }
@@ -108,19 +104,11 @@ body {
     border-color: #00FF00;
 }
 
-.light-laser {
-    margin-top: calc(var(--cell-size) * 0.23);
-    height: var(--laser-height);
-    width: var(--laser-width);
-    background-color: red;
-    display: flex;
-}
-
 .btn-mirror {
     width: 100%;
     height: 100%;
     border: 0;
-    background: linear-gradient(135deg, transparent 46%, #f0f0f0 46%, #f0f0f0 54%, transparent 54%);
+    background: linear-gradient(135deg, transparent 46%, #000000 46%, #000000 54%, transparent 54%);
     cursor: pointer;
 }