title: How can I underline all rows in textarea?
body: <p>How can I underline all rows in textarea?</p>
  
  <p>I need in something <a href="https://www.dropbox.com/s/km8pwik21nc4zr9/Screenshot%202015-02-23%2003.15.37.png?dl=0" rel="noreferrer">like this</a>.</p>
  
  <p>P.S. Textarea has style <code>padding: 10px</code></p>
  
  <p>I can't you background, because if I'll scroll this textarea, text will look <a href="https://www.dropbox.com/s/l3bhxa21daodz5x/Screenshot%202015-02-23%2003.26.14.png?dl=0" rel="noreferrer">like this</a>.</p>
  
  <p>Thank you!</p>