You need to add the module path to QML import path.

You can do that in 2 different ways:

Add "<path-to-qml-material>/modules" to your QML2_IMPORT_PATH env var.

Or add it in your main.cpp using
engine.addImportPath("<path-to-qml-material>/modules/");

@mcosta
thanks , but I don't know how to write any command.
QSPinBox:down-Arow?

Certainly, but I don't know how to insert code. They are just like this:

QDateEdit{ border-radius: 5px; padding: 1px 10px 1px 5px; border: 1px solid #5CACEE; min-height: 30px; } QDateEdit::drop-down { subcontrol-origin: padding; subcontrol-position: top right; **width: 35px; ** border-left-width: 1px; border-left-style: solid; border-top-right-radius: 3px; border-bottom-right-radius: 3px; border-left-color: #5CACEE; } QDateEdit::down-arrow { border-image: url(:/Resources/array_down.png); height:30px; width:30px; }

[edit: added missing coding tags ``` SGaist]