title: How to reset QApplication::styleSheet for certain buttons in application?
body: <p>In my main() function I'm setting styleSheet on all buttons of my application.</p>
  
  <pre><code>qApp-&gt;setStyleSheet("QPushButton {"
                              "     border: 1px solid #8f8f91;"
                              "     border-radius: 4px;"
                              "     background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #f6f7fa, stop: 1 #dadbde);"
                              "     padding: 3px;"
                              " }");
  </code></pre>
  
  <p>But now I need to reset the style of some buttons. I've tried <code>button-&gt;setStyleSheet("")</code>, but it is not working. So, how to do that?</p>