Add new PNG images for wheel and wheel click interactions

- Added `ruota.png` for the wheel graphic.
- Added `ruota_click.png` for the wheel click graphic.

src/style/main.css

@@ -14,6 +14,10 @@ html
     font-size: 1.01rem;
 }
 
+.btn{
+    cursor: pointer;
+}
+
 .main-container{
     height: 100vh;
     display: flex;
@@ -492,6 +496,15 @@ label > span{
     background-image: url(../assets/icone/arcata-inferiore_click.png);
 }
 
+.btn-ruota{
+    background-image: url("../assets/images/ruota.png");
+}
+
+.btn-ruota:hover, .btn-ruota.active{
+    background-image: url("../assets/images/ruota_click.png");
+}
+
+
 .btn-arcata-inferiore{
     background-image: url("../assets/images/arcata-inferiore.png");
 }