diff --git a/src/lib/components/Keyboard.ts b/src/lib/components/Keyboard.ts
index 0870035e..af1c3ef2 100644
--- a/src/lib/components/Keyboard.ts
+++ b/src/lib/components/Keyboard.ts
@@ -1459,14 +1459,17 @@ class SimpleKeyboard {
           attrObj.attribute &&
           typeof attrObj.attribute === "string" &&
           attrObj.value &&
-          typeof attrObj.value === "string" &&
-          attrObj.buttons &&
-          typeof attrObj.buttons === "string"
+          typeof attrObj.value === "string"
         ) {
-          const attrObjButtons = attrObj.buttons.split(" ");
-
-          if (attrObjButtons.includes(button)) {
+          // If buttons is empty, undefined, or not a string, apply to all buttons
+          if (!attrObj.buttons || typeof attrObj.buttons !== "string") {
             callback(attrObj.attribute, attrObj.value);
+          } else {
+            const attrObjButtons = attrObj.buttons.split(" ");
+
+            if (attrObjButtons.includes(button)) {
+              callback(attrObj.attribute, attrObj.value);
+            }
           }
         } else {
           console.warn(
diff --git a/src/lib/components/css/Keyboard.css b/src/lib/components/css/Keyboard.css
index 3747531d..bf95e3e6 100644
--- a/src/lib/components/css/Keyboard.css
+++ b/src/lib/components/css/Keyboard.css
@@ -24,7 +24,6 @@
 /* When using option "useButtonTag" */
 .hg-theme-default button.hg-button {
   border-width: 0;
-  outline: 0;
   font-size: inherit;
 }