<![CDATA[Changing QTabBar::tab border color breaks the width & padding?]]>I was styling my app and ran into some weird behavior when trying to override border colors, and was able to narrow it down to this minimal example...

With no styling my tabs look like this:

1923412d-dbf4-4409-b476-c9904668be6b-image.png

But when I apply any border related styling like the snippet below, it changes to this:

bca2fa31-5ec6-44ec-b700-9cd251be9c62-image.png

QTabBar::tab {
    border-color: black;
}

Can anyone please help me understand why this is happening? I'd like to change colors without side-effects like this

]]>https://forum.qt.io/topic/120486/changing-qtabbar-tab-border-color-breaks-the-width-paddingRSS for NodeThu, 12 Mar 2026 10:27:26 GMTMon, 02 Nov 2020 07:57:54 GMT60<![CDATA[Reply to Changing QTabBar::tab border color breaks the width & padding? on Mon, 02 Nov 2020 08:30:17 GMT]]>Without stylesheet a platform plugin is used to draw controls. When you set a border with qss the style for the control is changed to use the qss style with everything you didn't set left at defaults (no border, transparent background, no padding etc.).
Text color is sort of an exception, because it only overrides the palette, but for the most part when you use stylesheets it's all or nothing. If you want a custom qss border you need to recreate the rest of the native look i.e. set border (not just color), background and padding.

]]>https://forum.qt.io/post/625291https://forum.qt.io/post/625291Mon, 02 Nov 2020 08:30:17 GMT<![CDATA[Reply to Changing QTabBar::tab border color breaks the width & padding? on Mon, 02 Nov 2020 08:44:52 GMT]]>Ok thanks for the replies, I will try to recreate the Fusion style with my own QSS and colors

]]>https://forum.qt.io/post/625298https://forum.qt.io/post/625298Mon, 02 Nov 2020 08:44:52 GMT<![CDATA[Reply to Changing QTabBar::tab border color breaks the width & padding? on Mon, 02 Nov 2020 08:30:17 GMT]]>Without stylesheet a platform plugin is used to draw controls. When you set a border with qss the style for the control is changed to use the qss style with everything you didn't set left at defaults (no border, transparent background, no padding etc.).
Text color is sort of an exception, because it only overrides the palette, but for the most part when you use stylesheets it's all or nothing. If you want a custom qss border you need to recreate the rest of the native look i.e. set border (not just color), background and padding.

]]>https://forum.qt.io/post/625291https://forum.qt.io/post/625291Mon, 02 Nov 2020 08:30:17 GMT<![CDATA[Reply to Changing QTabBar::tab border color breaks the width & padding? on Mon, 02 Nov 2020 08:01:35 GMT]]>@Esor I guess you're overwriting the default style sheet with your own which only defines the border color, everything else is lost then. Check the default style-sheet.

]]>https://forum.qt.io/post/625285https://forum.qt.io/post/625285Mon, 02 Nov 2020 08:01:35 GMT