ADF Faces - Change style for menuTab component

How to change color for menuTab components (selected and enabled)?
I do not want to create new style, all I need is just change some colors and fonts for default oracle style.
I was able to change color for table, overridinf some styles in my css-file, but overriding
<af_menuTabs_selected> and <af_menuTabs_enabled> did not work, because on generated html-page menuTab components do not use any styles. Is there any workaround to change color of that component?
Thanks.

public String commandButton_action() {
ot_msg.setValue("Hello");
AdfFacesContext.getCurrentInstance().addPartialTarget(ot_msg);
The code above works fine but I nead also, in the method, to generate a excel file with JXLS librairie.
The file can takes a long time to download and thus I want to change the value of outputText while the file is generating and not after.
How can I do that ?
Thanks

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ADF Faces - Change style for menuTab component

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