document issue

README.md

@@ -30,3 +30,7 @@ panel serve app.py --dev
 ruff format
 ruff check --fix;
 ```
+
+## Known Issues
+
+- [ColorMap dark styling](https://github.com/holoviz/panel/issues/7360)

script.py

@@ -0,0 +1,16 @@
+import panel as pn
+import colorcet as cc
+
+pn.extension()
+
+CMAP_CSS = (
+    "div, div:hover {background: var(--panel-surface-color); color: current}" if pn.config.theme == "dark" else ""
+)
+
+cmap = pn.widgets.ColorMap(options=cc.palette, ncols=3, swatch_width=100, margin=(0, 0, 200, 0), stylesheet=[CMAP_CSS])
+
+pn.template.FastListTemplate(
+    sidebar=[cmap],
+    main_layout=None,
+    theme="dark"
+).servable()