title: hover button background color remains on mobile
body: <p>I styled a button:</p>
  
  <pre><code>.subscribe_button {
     background-color: red;
  }
  
  .subscribe_button:hover { 
     background-color: black;
  }
  </code></pre>
  
  <p>When I hover over the button, it turns black. However, on mobile, the background color of the button remains black even after hover. So I hover over the button, it turns black and remains black  How do I prevent it from remaining black after hover?</p>