style.stylesheet

QPushButton
{
  border: 2px solid black;
  border-radius: 5px;
  background-color: gray;
  width: 100%;
  height: 50%;
}
QPushButton:hover
{
  background-color:#b0b0b0;
  width: 120%;
  height: 50%;
}
QListWidget
{
  border: 2px solid gray;
}