<header class="banner" role="banner">
  <div class="container">
    <img class="banner-logo" src="images/london-tomster.png">
  </div>
</header>

<header class="banner" role="banner">
  <div class="container">
    <img class="banner-logo" src="images/london-tomster.png"
      alt="Welcome to Ember London. This is Ember’s mascot, Tomster. He’s helping us set the London scene by wearing a Royal Guard’s uniform and drinking a cup of tea.">
  </div>
</header>

Add alt tag to tomster
Add alt tag to tomster
