use styled-jsx in button

src/components/Button.tsx

@@ -20,12 +20,16 @@ const Button: FunctionComponent<{
       style={{
         background: color,
         color: textColor,
-        margin: "5px",
-        padding: "10px",
-        border: "none",
-        borderRadius: "4vw",
       }}
     >
+      <style jsx>{`
+        button {
+          margin: 5px;
+          padding: 10px;
+          border: none;
+          border-radius: 4vw;
+        }
+      `}</style>
       {text}
     </button>
   );