fix the error

assets/custom.css

@@ -32,11 +32,16 @@
 /* Removed any margin between consecutive .btn-secondary buttons */
 
 .hover-button {
-    border-width: 4px;
-    transition: border-color 0.2s ease-in-out;
+    border: 4px solid transparent;
+    /* Ensures border width remains consistent */
+    transition: border-color 0.2s ease-in-out, outline-width 0.2s ease-in-out;
+    box-sizing: border-box;
+    /* Ensures padding/border doesn't affect layout */
 }
 
 .hover-button:hover {
     border-color: black !important;
-    /* Changes border to black on hover */
+    /* Keeps border width, only changes color */
+    outline: 3px solid black;
+    /* Adds thickness without shifting layout */
 }