#button1 {
    android-elevation: 0;
    border-color: rgba(0, 0, 0, 0);
    border-width: 3;
}

#button2 {
    android-elevation: 0;
    border-color: rgba(0, 0, 0, 0.5);
    border-width: 3;
}

#button3 {
    android-elevation: 0;
    border-width: 3;
}