Ugly default orange close button when using QTabWidget::setTabsClosable

[zeux 0]

How would one go about making this button look better?

I am using QT 5.15 and would want it to look like this instead:

Any help is appreciated :)

[Christian Ehrlicher]

These are two different styles - a dark one and a light one.
So first you should make sure to use the same style.