min max close buttons

#titlebar-min{
     list-style-image: url("minimize-icon.png") !important;
     filter: invert(100%) !important;
}
#titlebar-min:hover{
    list-style-image: url("minimize-icon.png") !important;
    filter: invert(0%) !important;

     background-color: transparent !important;
}
#titlebar-max{
    list-style-image: url("restore-icon.png") !important;
    filter: invert(100%) !important;
}
#titlebar-max:hover{
   list-style-image: url("restore-icon.png") !important;
   filter: invert(0%) !important;
   background-color: transparent !important;
}
#titlebar-close{
    list-style-image: url("close-icon.png") !important;
    filter: invert(100%) !important;
}
#titlebar-close:hover{
    list-style-image: url("close-icon.png") !important;
    background-color: #ff00009c !important;
    filter: invert(100%) !important;
}
.titlebar-button > .toolbarbutton-icon {
    height: 20px !important;
    min-height: 20px !important;
    width: 20px !important;
    min-width: 20px !important;
}