Proton UI context menus with rounded hover style

menupopup > menuitem,
menupopup > menu
 {
    border-radius: 4px !important;
    margin-left: 8px !important;
    margin-right: 8px !important;
}

/* context menu top left button padding */
menugroup > menuitem:first-child {
    border-radius: 4px !important;
    padding-left: 8px !important;
}
/* context menu top right button padding */
menugroup > menuitem:last-child {
    border-radius: 4px !important;
    padding-right: 8px !important;

}
/* context menu top buttons radius*/
menugroup > menuitem {
    border-radius: 4px !important;
}
menugroup > menuitem > hbox > image {
  border-radius: 4px !important;
}
/* for menu item with submenu  */
.panel-header > .subviewbutton {
    border-radius: 4px !important;
  }