qt-ant-ui/widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QHBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    setAttribute(Qt::WA_TranslucentBackground);
    setStyleSheet("QWidget { background: transparent; }");

    QHBoxLayout *layout = new QHBoxLayout(this);
    layout->setContentsMargins(50, 50, 50, 50);
    layout->setSpacing(0);

    priBtn = new QAntPrimaryButton(this);
    priBtn->setText("Hello world");
    priBtn->setFixedSize(200, 100);
    layout->addWidget(priBtn, 0, Qt::AlignCenter);

    setLayout(layout);
}

Widget::~Widget()
{
    delete ui;
}