Element CSS Chanche font size, Zoom

Between the style tags, give the p elements font-size of 16px. Browser and Text zoom should be at 100%.
The Browser and the text zoom are at 100%

<style>
  .red-text {
    color: red;
  }
  
  .p{
    font-size: 16px;
  }
  
</style>

<h2 class="red-text">CatPhotoApp</h2>

WHAT SHOULD I DO?