Update README.md

README.md

@@ -89,7 +89,7 @@ An inverse trend can be observed, with SLIMER emerging as the most effective in
             font-size: 12px;
         }
         th, td {
-            border: 1px solid black;
+            border: 1px none;
             padding: 4px;
             text-align: center;
         }