diff --git a/templates/login/opt_input.html b/templates/login/opt_input.html
index 8a233d7..7493a11 100644
--- a/templates/login/opt_input.html
+++ b/templates/login/opt_input.html
@@ -56,7 +56,8 @@ function OTPInput() {
             }
 
             // Add new digit
-            else if (event.keyCode >= 48 && event.keyCode <= 57) {
+            else if ((event.keyCode >= 48 && event.keyCode <= 57)
+                || (event.keyCode >= 96 && event.keyCode <= 105)){
                 inputs[i].value = event.key;
                 if (i !== inputs.length - 1)
                     inputs[i + 1].focus();