title: PyQT LineEdit Border Color
body: <p>To bring the user's attention to the text field with an error (or if it is not filled) I colorize this QLineEdit) using:</p>
  
  <pre><code>red = "QWidget { background-color:#8B0000;}"
  my_cool_QLineEdit.setStyleSheet(red)
  </code></pre>
  
  <p>That makes an entire background of this QLineEdit red. While the message is definitely  sent that doesn't look too tasteful. Instead of QLineEdit's background I wonder if it is possible to turn only its borders red. What method to use? Many thanks in advance!</p>