title: Text field "glowing" effect like Twitter and Tumblr login pages?
body: <p>What's the best way to achieve a glowing effect when focusing on a text field in HTML? Can it be done with CSS alone, or does it involve images? Check out the login pages for Twitter and Tumblr for working examples. </p>
  
  <p><img src="https://i.stack.imgur.com/BIF3d.png" alt="enter image description here"></p>