diff --git a/src/components/DeckButton.tsx b/src/components/DeckButton.tsx
index f16cf53..470bf58 100644
--- a/src/components/DeckButton.tsx
+++ b/src/components/DeckButton.tsx
@@ -18,7 +18,7 @@ export default function DeckButton(props: Props) {
 const style = StyleSheet.create({
   view: {
     backgroundColor: '#ff4000',
-    flexBasis: '25%',
+    flexBasis: (1 / 3) * 100 + '%',
     height: 80,
   },
   text: {