Vue Js Change Button Border Color on Click

<html>
<head>
  <script type="importmap">
      {
        "imports": {
          "vue": "https://unpkg.com/vue@3/dist/vue.esm-browser.js"
        }
      }
    </script>
</head>
<body>
  <div id="app">
    <h3>Vue Js Change Button Border Color on Click</h3>
    <button @click="toggleBorderColor" :class="[btnClass, 'my-btn']">Toggle Border Color</button>

</div>
  <script type="module">
    import { createApp } from "vue";
    createApp({
      data() {
        return {
          btnClass: "red-border-color",
        }
      },
      methods: {
        toggleBorderColor() {
          if (this.btnClass === "red-border-color") {
            this.btnClass = "yellow-border-color";
          } else {
            this.btnClass = "red-border-color";
          }
        }
      }

}).mount("#app");
  </script>
  <style>
    .my-btn {
      padding: 10px 150px;
      color: #fff;
      background-color: blue;
      border: 2px solid black;
      cursor: pointer;
    }

.red-border-color {
      border-color: red;
    }

.yellow-border-color {
      border-color: yellow;
    }
  </style>
</body>
</html>