This theme is based on the default/basic theme of Qt Quick Controls 2 5.12.10 https://code.qt.io/cgit/qt/qtquickcontrols2.git/tree/src/imports/controls?h=5.12.10.
This fork contains mostly workarounds for keyboard navigation, and smaller default sizes for some controls.
You can use this program either under the terms of the GNU GPLv2 license (or any later version) or under the terms of the GNU LGPLv3 license. See the included LICENSE.GPL and LICENSE.LGPLv3 files.