diff --git a/src/css/style.css b/src/css/style.css
index 1147f76..810d869 100644
--- a/src/css/style.css
+++ b/src/css/style.css
@@ -118,8 +118,8 @@ ol {
     opacity: 1;
   }
   & img {
-    width: 40px;
-    height: 40px;
+    width: 100%;
+    height: 100%;
   }
 }
 #toggle-canvas {