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Issue in sliders font colour when "fast" design is applied #8571

Description

@TheoMathurin

ALL software version info

Software Version Info
panel 1.8.10
bokeh 3.9

Description of expected behavior and the observed behavior

We should be able to see the slider label and value. However, the text colour is the same as the background colour, so that it's not visible.

Complete, minimal, self-contained example code that reproduces the issue

import panel as pn

pn.extension(design="fast")

pn.widgets.IntSlider(name="Slider", value=50, start=0, end=100).servable()

Screenshots or screencasts of the bug in action

Capture.video.du.2026-04-29.14-49-30.mp4

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