app/ui/styles/style.qss

QMainWindow{
    color: white;
    background-color: #202123;
}
QPushButton {
  position: relative;
  padding: 10px 20px;
  border-radius: 7px;
  border: 1.5px solid #9342ff;
  font-size: 12px;
  font-weight: 500;
  font-family: Oswald, Arial, sans-serif;
  letter-spacing: 1px;

  color: #ffffff;
  overflow: hidden;
  box-shadow: 0 0 0 0 #000000;
}
QPushButton:hover {
  background: #9342ff;
  box-shadow: 0 0 30px 5px rgba(0, 142, 236, 0.815);
  border: 1.5px solid transparent;
}
QRadioButton{
    font-size: 16px;
    color: #fae69e;
    font-weight: semi-bold;
}
QToolTip {
    font-size: 12px;
    font-weight: semi-bold;
    color: white;
    background-color: #2c0067;
    border: 1px solid #8b01ff;
}
#logout_button {
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 14px;
}
#logout_button:hover {
    background-color: #e81123;
    color: #ffffff;
    border: 1.5px solid transparent;
}

#side_navigation{
    background-color: #202123;
    padding: 0px 0px;
}
#main_content {
    background-color: #444654;
    padding: 0px 0px;
    border-radius: 12px;
}
#luckyButton {
  position: relative;
  padding: 22px 20px;
  border-radius: 7px;
  border: 1.5px solid #9342ff;
  font-size: 12px;
  font-weight: 500;
  font-family: Oswald, Arial, sans-serif;
  letter-spacing: 1px;

  color: #ffffff;
  overflow: hidden;
  box-shadow: 0 0 0 0 #000000;
}
#luckyButton:hover {
  background: #33beff;
  box-shadow: 0 0 30px 5px rgba(0, 142, 236, 0.815);
  border: 1.5px solid transparent;
}