title: Set widget background color
body: <p>I use <code>QCheckBox</code> in <code>QTableWidgetCell</code></p>
  
  <pre><code>QWidget *widget = new QWidget();
  QCheckBox *checkBox = new QCheckBox();
  QHBoxLayout *layout = new QHBoxLayout(widget);
  layout-&gt;addWidget(checkBox);
  layout-&gt;setAlignment(Qt::AlignCenter);
  layout-&gt;setContentsMargins(0, 0, 0, 0);
  widget-&gt;setLayout(layout);
  table-&gt;setCellWidget(0, 0, widget);
  </code></pre>
  
  <p>How can I change cell background?</p>