bigger arrow heads and lower

index.html

@@ -51,10 +51,10 @@
         .slider::after {
             content: '';
             position: absolute;
-            top: 50%;
+            top: 20%;
             transform: translateY(-50%);
-            width: 20px;
-            height: 20px;
+            width: 30px;
+            height: 30px;
             background-size: contain;
             background-repeat: no-repeat;
             transition: opacity 0.3s;