BUG: Fix set_sticky background (#47082)

Author: ShawnZhong

doc/source/whatsnew/v1.5.0.rst

@@ -882,6 +882,7 @@ Styler
 ^^^^^^
 - Bug when attempting to apply styling functions to an empty DataFrame subset (:issue:`45313`)
 - Bug in :class:`CSSToExcelConverter` leading to ``TypeError`` when border color provided without border style for ``xlsxwriter`` engine (:issue:`42276`)
+- Bug in :meth:`Styler.set_sticky` leading to white text on white background in dark mode (:issue:`46984`)
 
 Metadata
 ^^^^^^^^

pandas/io/formats/style.py

@@ -2283,7 +2283,7 @@ def set_sticky(
         obj = self.data.index if axis == 0 else self.data.columns
         pixel_size = (75 if axis == 0 else 25) if not pixel_size else pixel_size
 
-        props = "position:sticky; background-color:white;"
+        props = "position:sticky; background-color:inherit;"
         if not isinstance(obj, pd.MultiIndex):
             # handling MultiIndexes requires different CSS
 

pandas/tests/io/formats/style/test_html.py

@@ -302,11 +302,11 @@ def test_sticky_basic(styler, index, columns, index_name):
         styler.set_sticky(axis=1)
 
     left_css = (
-        "#T_ {0} {{\n  position: sticky;\n  background-color: white;\n"
+        "#T_ {0} {{\n  position: sticky;\n  background-color: inherit;\n"
         "  left: 0px;\n  z-index: {1};\n}}"
     )
     top_css = (
-        "#T_ {0} {{\n  position: sticky;\n  background-color: white;\n"
+        "#T_ {0} {{\n  position: sticky;\n  background-color: inherit;\n"
         "  top: {1}px;\n  z-index: {2};\n{3}}}"
     )
 
@@ -338,11 +338,11 @@ def test_sticky_mi(styler_mi, index, columns):
         styler_mi.set_sticky(axis=1)
 
     left_css = (
-        "#T_ {0} {{\n  position: sticky;\n  background-color: white;\n"
+        "#T_ {0} {{\n  position: sticky;\n  background-color: inherit;\n"
         "  left: {1}px;\n  min-width: 75px;\n  max-width: 75px;\n  z-index: {2};\n}}"
     )
     top_css = (
-        "#T_ {0} {{\n  position: sticky;\n  background-color: white;\n"
+        "#T_ {0} {{\n  position: sticky;\n  background-color: inherit;\n"
         "  top: {1}px;\n  height: 25px;\n  z-index: {2};\n}}"
     )
 
@@ -374,11 +374,11 @@ def test_sticky_levels(styler_mi, index, columns, levels):
         styler_mi.set_sticky(axis=1, levels=levels)
 
     left_css = (
-        "#T_ {0} {{\n  position: sticky;\n  background-color: white;\n"
+        "#T_ {0} {{\n  position: sticky;\n  background-color: inherit;\n"
         "  left: {1}px;\n  min-width: 75px;\n  max-width: 75px;\n  z-index: {2};\n}}"
     )
     top_css = (
-        "#T_ {0} {{\n  position: sticky;\n  background-color: white;\n"
+        "#T_ {0} {{\n  position: sticky;\n  background-color: inherit;\n"
         "  top: {1}px;\n  height: 25px;\n  z-index: {2};\n}}"
     )